Solution recrystallization should be defined. Concept introduction: Sublimation, extraction and chromatography are methods that are used for purification of organic compounds. But recrystallization involves isolation of compounds with extremely high purity. Recrystallization is one of techniques that are employed to purify organic compounds.

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Answer 1

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Criteria mentioned below should be used to select solvent for recrystallization.

1. Solvent should be able to dissolve desired compound in itself at high temperatures but insoluble at low temperatures. In short, solvent with favorable temperature coefficient should be used for particular solute.

2. Solvent should be chosen in such way that impurities are either insoluble in it or remain moderately soluble in it at low temperatures.

3. Boiling point of desired solvent should be low so that it gets separated from crystals easily.

4. Boiling point of solvent should be less than melting point of solid under consideration.

Occlusion occurs when one substance is included into another one. This process usually occurs if crystallization or precipitation occurs at high speeds.

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Which is not required in recrystallization? a. solution is filtered at high temperature b. moderate volatility solvent c. saturated solution d. solvent must dissolve the impurities

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Answer 2

Question

Criteria mentioned below should be used to select solvent for recrystallization.

1. Solvent should be able to dissolve desired compound in itself at high temperatures but insoluble at low temperatures. In short, solvent with favorable temperature coefficient should be used for particular solute.

2. Solvent should be chosen in such way that impurities are either insoluble in it or remain moderately soluble in it at low temperatures.

3. Boiling point of desired solvent should be low so that it gets separated from crystals easily.

4. Boiling point of solvent should be less than melting point of solid under consideration.

Occlusion occurs when one substance is included into another one. This process usually occurs if crystallization or precipitation occurs at high speeds.

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Answer 3

Question

Criteria mentioned below should be used to select solvent for recrystallization.

1. Solvent should be able to dissolve desired compound in itself at high temperatures but insoluble at low temperatures. In short, solvent with favorable temperature coefficient should be used for particular solute.

2. Solvent should be chosen in such way that impurities are either insoluble in it or remain moderately soluble in it at low temperatures.

3. Boiling point of desired solvent should be low so that it gets separated from crystals easily.

4. Boiling point of solvent should be less than melting point of solid under consideration.

Occlusion occurs when one substance is included into another one. This process usually occurs if crystallization or precipitation occurs at high speeds.

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Answer 4

Question

Criteria mentioned below should be used to select solvent for recrystallization.

1. Solvent should be able to dissolve desired compound in itself at high temperatures but insoluble at low temperatures. In short, solvent with favorable temperature coefficient should be used for particular solute.

2. Solvent should be chosen in such way that impurities are either insoluble in it or remain moderately soluble in it at low temperatures.

3. Boiling point of desired solvent should be low so that it gets separated from crystals easily.

4. Boiling point of solvent should be less than melting point of solid under consideration.

Occlusion occurs when one substance is included into another one. This process usually occurs if crystallization or precipitation occurs at high speeds.

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Answer 5

Criteria mentioned below should be used to select solvent for recrystallization.

1. Solvent should be able to dissolve desired compound in itself at high temperatures but insoluble at low temperatures. In short, solvent with favorable temperature coefficient should be used for particular solute.

2. Solvent should be chosen in such way that impurities are either insoluble in it or remain moderately soluble in it at low temperatures.

3. Boiling point of desired solvent should be low so that it gets separated from crystals easily.

4. Boiling point of solvent should be less than melting point of solid under consideration.

Occlusion occurs when one substance is included into another one. This process usually occurs if crystallization or precipitation occurs at high speeds.

Answer 6

Chapter 3.2, Problem 1E

a)

Interpretation Introduction

Interpretation:Solution recrystallization should be defined.

Concept introduction: Sublimation, extraction and chromatography are methods that are used for purification of organic compounds. But recrystallization involves isolation of compounds with extremely high purity. Recrystallization is one of techniques that are employed to purify organic compounds.

a)

Expert Solution

Explanation of Solution

Solution recrystallization or simply recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 7

Chapter 3.2, Problem 1E

a)

Interpretation Introduction

Interpretation:Solution recrystallization should be defined.

Concept introduction: Sublimation, extraction and chromatography are methods that are used for purification of organic compounds. But recrystallization involves isolation of compounds with extremely high purity. Recrystallization is one of techniques that are employed to purify organic compounds.

Answer 8

a)

Expert Solution

Explanation of Solution

Solution recrystallization or simply recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 9

a)

Expert Solution

Answer 10

a)

Expert Solution

Answer 11

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Answer 12

b)

Interpretation Introduction

Interpretation:Temperature coefficient of solvent should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

b)

Expert Solution

Explanation of Solution

Recrystallization solvent should be chosen in such way that compound is insoluble at low temperatures but becomes soluble at high temperatures. This variance in solubility of compound is governed by temperature coefficient of solvent.

Answer 13

b)

Interpretation Introduction

Interpretation:Temperature coefficient of solvent should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 14

b)

Expert Solution

Explanation of Solution

Recrystallization solvent should be chosen in such way that compound is insoluble at low temperatures but becomes soluble at high temperatures. This variance in solubility of compound is governed by temperature coefficient of solvent.

Answer 15

b)

Expert Solution

Answer 16

b)

Expert Solution

Answer 17

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Answer 18

c)

Interpretation Introduction

Interpretation:Relationship between dielectric constant and polarity of solvent should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

c)

Expert Solution

Explanation of Solution

Most commonly used solvents for recrystallization varies widely in terms of their polarities. These polarities are measured by respective dielectric constants. Solvents with dielectric constants from 2 to 3 are nonpolar while those with values of dielectric constants more than 10 are polar. Solvents with dielectric constant in range of 3 to 10 are considered as intermediate polar. Polar compounds are usually soluble in polar solvents and vice-versa. So polarity of solvent is directly related to dielectric constant.

Answer 19

c)

Interpretation Introduction

Interpretation:Relationship between dielectric constant and polarity of solvent should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 20

c)

Expert Solution

Explanation of Solution

Most commonly used solvents for recrystallization varies widely in terms of their polarities. These polarities are measured by respective dielectric constants. Solvents with dielectric constants from 2 to 3 are nonpolar while those with values of dielectric constants more than 10 are polar. Solvents with dielectric constant in range of 3 to 10 are considered as intermediate polar. Polar compounds are usually soluble in polar solvents and vice-versa. So polarity of solvent is directly related to dielectric constant.

Answer 21

c)

Expert Solution

Answer 22

c)

Expert Solution

Answer 23

Expert Solution

Answer 24

d)

Interpretation Introduction

Interpretation:Petroleum ether should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

d)

Expert Solution

Explanation of Solution

Petroleum ether is generally used as solvent in recrystallization process. It is flammable and highly volatile in nature. It is also known as benzene. Chemical structure for petroleum ether does not contain ether functional group but consists of aliphatic hydrocarbons and has chemical formula of C6−16H12−34 .

Answer 25

d)

Interpretation Introduction

Interpretation:Petroleum ether should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 26

d)

Expert Solution

Explanation of Solution

Petroleum ether is generally used as solvent in recrystallization process. It is flammable and highly volatile in nature. It is also known as benzene. Chemical structure for petroleum ether does not contain ether functional group but consists of aliphatic hydrocarbons and has chemical formula of C6−16H12−34 .

Answer 27

d)

Expert Solution

Answer 28

d)

Expert Solution

Answer 29

Expert Solution

Answer 30

e)

Interpretation Introduction

Interpretation:Mixed solvents should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

e)

Expert Solution

Explanation of Solution

If more than one solvent exists in mixture, it is termed as mixed solvent. So mixed solvents are usually made up of two or more types of single solvents. For example, isoamyl or banana oil is mixed solvent.

Answer 31

e)

Interpretation Introduction

Interpretation:Mixed solvents should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 32

e)

Expert Solution

Explanation of Solution

If more than one solvent exists in mixture, it is termed as mixed solvent. So mixed solvents are usually made up of two or more types of single solvents. For example, isoamyl or banana oil is mixed solvent.

Answer 33

e)

Expert Solution

Answer 34

e)

Expert Solution

Answer 35

Expert Solution

Answer 36

f)

Interpretation Introduction

Interpretation:Solvent selection should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

f)

Expert Solution

Explanation of Solution

Criteria mentioned below should be used to select solvent for recrystallization.

1. Solvent should be able to dissolve desired compound in itself at high temperatures but insoluble at low temperatures. In short, solvent with favorable temperature coefficient should be used for particular solute.

2. Solvent should be chosen in such way that impurities are either insoluble in it or remain moderately soluble in it at low temperatures.

3. Boiling point of desired solvent should be low so that it gets separated from crystals easily.

4. Boiling point of solvent should be less than melting point of solid under consideration.

5. There should be no reaction between solvent and substance that needs to be purified.

Answer 37

f)

Interpretation Introduction

Interpretation:Solvent selection should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 38

f)

Expert Solution

Explanation of Solution

Criteria mentioned below should be used to select solvent for recrystallization.

1. Solvent should be able to dissolve desired compound in itself at high temperatures but insoluble at low temperatures. In short, solvent with favorable temperature coefficient should be used for particular solute.

2. Solvent should be chosen in such way that impurities are either insoluble in it or remain moderately soluble in it at low temperatures.

3. Boiling point of desired solvent should be low so that it gets separated from crystals easily.

4. Boiling point of solvent should be less than melting point of solid under consideration.

5. There should be no reaction between solvent and substance that needs to be purified.

Answer 39

f)

Expert Solution

Answer 40

f)

Expert Solution

Answer 41

Expert Solution

Answer 42

g)

Interpretation Introduction

Interpretation:Filter-aid should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

g)

Expert Solution

Explanation of Solution

Filter aid is substance or agent that is composed of solid particles and is used to improve efficiency of filtration. Its use also controls flow of liquids and removal of solid particles.

Answer 43

g)

Interpretation Introduction

Interpretation:Filter-aid should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 44

g)

Expert Solution

Explanation of Solution

Filter aid is substance or agent that is composed of solid particles and is used to improve efficiency of filtration. Its use also controls flow of liquids and removal of solid particles.

Answer 45

g)

Expert Solution

Answer 46

g)

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Answer 47

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Answer 48

h)

Interpretation Introduction

Interpretation:Hot filtration should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

h)

Expert Solution

Explanation of Solution

Hot filtration is technique that is used in recrystallization process when insoluble solid impurities are present in solvent. This process is essential to follow when activated charcoal is used to remove colored impurities in recrystallization process.

Answer 49

h)

Interpretation Introduction

Interpretation:Hot filtration should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 50

h)

Expert Solution

Explanation of Solution

Hot filtration is technique that is used in recrystallization process when insoluble solid impurities are present in solvent. This process is essential to follow when activated charcoal is used to remove colored impurities in recrystallization process.

Answer 51

h)

Expert Solution

Answer 52

h)

Expert Solution

Answer 53

Expert Solution

Answer 54

i)

Interpretation Introduction

Interpretation:Seeding should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

i)

Expert Solution

Explanation of Solution

Seeding is method that is used to control supersaturation. Supersaturated solutions are allowed to form crystals by process of seeding. Any of crystals formed are added to solution to induce crystallization that occurs on rapid pace.

Answer 55

i)

Interpretation Introduction

Interpretation:Seeding should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 56

i)

Expert Solution

Explanation of Solution

Seeding is method that is used to control supersaturation. Supersaturated solutions are allowed to form crystals by process of seeding. Any of crystals formed are added to solution to induce crystallization that occurs on rapid pace.

Answer 57

i)

Expert Solution

Answer 58

i)

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Answer 59

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Answer 60

j)

Interpretation Introduction

Interpretation:Vacuum filtration should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

j)

Expert Solution

Explanation of Solution

Vacuum filtration is technique that is applied to separate solid products from liquids. It is performed with help of Buchner funnel that is attached to vacuum filter flask with aid of rubber stopper or neoprene adapter. Side arm of filter flask is attached to house vacuum line through trap called filter trap. This trap is used for collection of overflowed filtrate from filter flask.

Answer 61

j)

Interpretation Introduction

Interpretation:Vacuum filtration should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 62

j)

Expert Solution

Explanation of Solution

Vacuum filtration is technique that is applied to separate solid products from liquids. It is performed with help of Buchner funnel that is attached to vacuum filter flask with aid of rubber stopper or neoprene adapter. Side arm of filter flask is attached to house vacuum line through trap called filter trap. This trap is used for collection of overflowed filtrate from filter flask.

Answer 63

j)

Expert Solution

Answer 64

j)

Expert Solution

Answer 65

Expert Solution

Answer 66

k)

Interpretation Introduction

Interpretation:Mother liquor should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

k)

Expert Solution

Explanation of Solution

Mother liquor is nothing but part of solution that remains after crystallization of pure compound. This liquid is generally obtained in filtration process.

Answer 67

k)

Interpretation Introduction

Interpretation:Mother liquor should be defined.

Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 68

k)

Expert Solution

Explanation of Solution

Mother liquor is nothing but part of solution that remains after crystallization of pure compound. This liquid is generally obtained in filtration process.

Answer 69

k)

Expert Solution

Answer 70

k)

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Answer 71

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Answer 72

l)

Interpretation Introduction

Interpretation:Filtrate should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

l)

Expert Solution

Explanation of Solution

Filtration is procedure that is used to remove insoluble impurities, decolorized activated carbon from solution and also for purification of compound. Liquid that has been passed through filter apparatus is called filtrate while solid that cannot pass through filter is known as residue.

Answer 73

l)

Interpretation Introduction

Interpretation:Filtrate should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 74

l)

Expert Solution

Explanation of Solution

Filtration is procedure that is used to remove insoluble impurities, decolorized activated carbon from solution and also for purification of compound. Liquid that has been passed through filter apparatus is called filtrate while solid that cannot pass through filter is known as residue.

Answer 75

l)

Expert Solution

Answer 76

l)

Expert Solution

Answer 77

Expert Solution

Answer 78

m)

Interpretation Introduction

Interpretation: Solute should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

m)

Expert Solution

Explanation of Solution

Solution always has two components, one is solute and another is solvent. Solute is that part of solution that is present in small quantity and that dissolves itself into another component called solvent. So solvent is present in larger amount in solution and it dissolves solute in itself.

Answer 79

m)

Interpretation Introduction

Interpretation: Solute should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 80

m)

Expert Solution

Explanation of Solution

Solution always has two components, one is solute and another is solvent. Solute is that part of solution that is present in small quantity and that dissolves itself into another component called solvent. So solvent is present in larger amount in solution and it dissolves solute in itself.

Answer 81

m)

Expert Solution

Answer 82

m)

Expert Solution

Answer 83

Expert Solution

Answer 84

n)

Interpretation Introduction

Interpretation: Solvent should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

n)

Expert Solution

Explanation of Solution

Solution always has two components, one is solute and another is solvent. Solute is that part of solution that is present in small quantity and that dissolves itself into another component called solvent. So solvent is present in larger amount in solution and it dissolves solute in itself.

Answer 85

n)

Interpretation Introduction

Interpretation: Solvent should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 86

n)

Expert Solution

Explanation of Solution

Solution always has two components, one is solute and another is solvent. Solute is that part of solution that is present in small quantity and that dissolves itself into another component called solvent. So solvent is present in larger amount in solution and it dissolves solute in itself.

Answer 87

n)

Expert Solution

Answer 88

n)

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Answer 89

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Answer 90

o)

Interpretation Introduction

Interpretation:Occlusion should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

o)

Expert Solution

Explanation of Solution

Occlusion occurs when one substance is included into another one. This process usually occurs if crystallization or precipitation occurs at high speeds.

Answer 91

o)

Interpretation Introduction

Interpretation:Occlusion should be defined.

Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.

Answer 92

o)

Expert Solution

Explanation of Solution

Occlusion occurs when one substance is included into another one. This process usually occurs if crystallization or precipitation occurs at high speeds.

Answer 93

o)

Expert Solution

Answer 94

o)

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Answer 95

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Answer 96

Ch. 3.2 - Prob. 1E Ch. 3.2 - Prob. 2E Ch. 3.2 - Prob. 3E Ch. 3.2 - Prob. 4E Ch. 3.2 - Prob. 5E Ch. 3.2 - Prob. 6E Ch. 3.2 - Prob. 7E Ch. 3.2 - Prob. 8E Ch. 3.2 - Prob. 9E Ch. 3.2 - Prob. 10E

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