The characteristics of good solvents should be described. Concept introduction: Recrystallization is a process in which a crystalline solid dissolved in hot solvent precipitates back on the cooling of the solvent. For successful recrystallization, the solute must have maximum solubility in the hot solvent and minimum solubility in the cold solvent because if solute has good solubility in cold solvent there will be loss of compound on recrystallization. To minimize this loss, the choice of the recrystallization solvent is important.

Question

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Answer 1

Question

Chapter 15, Problem 1Q

Interpretation Introduction

Interpretation:

The characteristics of good solvents should be described.

Concept introduction:

Recrystallization is a process in which a crystalline solid dissolved in hot solvent precipitates back on the cooling of the solvent. For successful recrystallization, the solute must have maximum solubility in the hot solvent and minimum solubility in the cold solvent because if solute has good solubility in cold solvent there will be loss of compound on recrystallization.

To minimize this loss, the choice of the recrystallization solvent is important.

Expert Solution & Answer

Explanation of Solution

Characteristics of good recrystallization solvent are as follows:

Solvents boiling point must be smaller than compounds melting point.
Compound to be purified must not be soluble in the solvent at room temperature.
The solvent must be inert to the compound to be purified.
The solvent must have low solubility for compound at lower temperatures and high solubility at a higher temperature.
An abundant amount of crystals must be recovered from the cool solvent.
For effective recrystallization, solubility of organic solids in the solvent should not be too large because it will be difficult to recover the compound.
The solubility of organic solid should not be too small, else a huge volume of solvent will be needed to dissolve the compound.

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Part VII. Below are the 'HNMR, 13 C-NMR, COSY 2D- NMR, and HSQC 2D-NMR (similar with HETCOR but axes are reversed) spectra of an organic compound with molecular formula C6H1003 - Assign chemical shift values to the H and c atoms of the compound. Find the structure. Show complete solutions. Predicted 1H NMR Spectrum 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 f1 (ppm) Predicted 13C NMR Spectrum 100 f1 (ppm) 30 220 210 200 190 180 170 160 150 140 130 120 110 90 80 70 -26 60 50 40 46 30 20 115 10 1.0 0.9 0.8 0 -10

Q: Arrange BCC and Fec metals, in sequence from the Fable (Dr. R's slides) and Calculate Volume and Density. Aa BCC V 52 5 SFCC

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Answer 2

Question

Chapter 15, Problem 1Q

Interpretation Introduction

Interpretation:

The characteristics of good solvents should be described.

Concept introduction:

Recrystallization is a process in which a crystalline solid dissolved in hot solvent precipitates back on the cooling of the solvent. For successful recrystallization, the solute must have maximum solubility in the hot solvent and minimum solubility in the cold solvent because if solute has good solubility in cold solvent there will be loss of compound on recrystallization.

To minimize this loss, the choice of the recrystallization solvent is important.

Expert Solution & Answer

Explanation of Solution

Characteristics of good recrystallization solvent are as follows:

Solvents boiling point must be smaller than compounds melting point.
Compound to be purified must not be soluble in the solvent at room temperature.
The solvent must be inert to the compound to be purified.
The solvent must have low solubility for compound at lower temperatures and high solubility at a higher temperature.
An abundant amount of crystals must be recovered from the cool solvent.
For effective recrystallization, solubility of organic solids in the solvent should not be too large because it will be difficult to recover the compound.
The solubility of organic solid should not be too small, else a huge volume of solvent will be needed to dissolve the compound.

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Answer 3

Question

Chapter 15, Problem 1Q

Interpretation Introduction

Interpretation:

The characteristics of good solvents should be described.

Concept introduction:

Recrystallization is a process in which a crystalline solid dissolved in hot solvent precipitates back on the cooling of the solvent. For successful recrystallization, the solute must have maximum solubility in the hot solvent and minimum solubility in the cold solvent because if solute has good solubility in cold solvent there will be loss of compound on recrystallization.

To minimize this loss, the choice of the recrystallization solvent is important.

Expert Solution & Answer

Explanation of Solution

Characteristics of good recrystallization solvent are as follows:

Solvents boiling point must be smaller than compounds melting point.
Compound to be purified must not be soluble in the solvent at room temperature.
The solvent must be inert to the compound to be purified.
The solvent must have low solubility for compound at lower temperatures and high solubility at a higher temperature.
An abundant amount of crystals must be recovered from the cool solvent.
For effective recrystallization, solubility of organic solids in the solvent should not be too large because it will be difficult to recover the compound.
The solubility of organic solid should not be too small, else a huge volume of solvent will be needed to dissolve the compound.

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Answer 4

Question

Chapter 15, Problem 1Q

Interpretation Introduction

Interpretation:

The characteristics of good solvents should be described.

Concept introduction:

Recrystallization is a process in which a crystalline solid dissolved in hot solvent precipitates back on the cooling of the solvent. For successful recrystallization, the solute must have maximum solubility in the hot solvent and minimum solubility in the cold solvent because if solute has good solubility in cold solvent there will be loss of compound on recrystallization.

To minimize this loss, the choice of the recrystallization solvent is important.

Expert Solution & Answer

Explanation of Solution

Characteristics of good recrystallization solvent are as follows:

Solvents boiling point must be smaller than compounds melting point.
Compound to be purified must not be soluble in the solvent at room temperature.
The solvent must be inert to the compound to be purified.
The solvent must have low solubility for compound at lower temperatures and high solubility at a higher temperature.
An abundant amount of crystals must be recovered from the cool solvent.
For effective recrystallization, solubility of organic solids in the solvent should not be too large because it will be difficult to recover the compound.
The solubility of organic solid should not be too small, else a huge volume of solvent will be needed to dissolve the compound.

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Answer 5

Chapter 15, Problem 1Q

Interpretation Introduction

Interpretation:

The characteristics of good solvents should be described.

Concept introduction:

Recrystallization is a process in which a crystalline solid dissolved in hot solvent precipitates back on the cooling of the solvent. For successful recrystallization, the solute must have maximum solubility in the hot solvent and minimum solubility in the cold solvent because if solute has good solubility in cold solvent there will be loss of compound on recrystallization.

To minimize this loss, the choice of the recrystallization solvent is important.

Expert Solution & Answer

Explanation of Solution

Characteristics of good recrystallization solvent are as follows:

Solvents boiling point must be smaller than compounds melting point.
Compound to be purified must not be soluble in the solvent at room temperature.
The solvent must be inert to the compound to be purified.
The solvent must have low solubility for compound at lower temperatures and high solubility at a higher temperature.
An abundant amount of crystals must be recovered from the cool solvent.
For effective recrystallization, solubility of organic solids in the solvent should not be too large because it will be difficult to recover the compound.
The solubility of organic solid should not be too small, else a huge volume of solvent will be needed to dissolve the compound.

Answer 6

Chapter 15, Problem 1Q

Interpretation Introduction

Interpretation:

The characteristics of good solvents should be described.

Concept introduction:

Recrystallization is a process in which a crystalline solid dissolved in hot solvent precipitates back on the cooling of the solvent. For successful recrystallization, the solute must have maximum solubility in the hot solvent and minimum solubility in the cold solvent because if solute has good solubility in cold solvent there will be loss of compound on recrystallization.

To minimize this loss, the choice of the recrystallization solvent is important.

Expert Solution & Answer

Explanation of Solution

Characteristics of good recrystallization solvent are as follows:

Solvents boiling point must be smaller than compounds melting point.
Compound to be purified must not be soluble in the solvent at room temperature.
The solvent must be inert to the compound to be purified.
The solvent must have low solubility for compound at lower temperatures and high solubility at a higher temperature.
An abundant amount of crystals must be recovered from the cool solvent.
For effective recrystallization, solubility of organic solids in the solvent should not be too large because it will be difficult to recover the compound.
The solubility of organic solid should not be too small, else a huge volume of solvent will be needed to dissolve the compound.

Answer 7

Chapter 15, Problem 1Q

Interpretation Introduction

Interpretation:

The characteristics of good solvents should be described.

Concept introduction:

Recrystallization is a process in which a crystalline solid dissolved in hot solvent precipitates back on the cooling of the solvent. For successful recrystallization, the solute must have maximum solubility in the hot solvent and minimum solubility in the cold solvent because if solute has good solubility in cold solvent there will be loss of compound on recrystallization.

To minimize this loss, the choice of the recrystallization solvent is important.

Answer 8

Expert Solution & Answer

Explanation of Solution

Characteristics of good recrystallization solvent are as follows:

Solvents boiling point must be smaller than compounds melting point.
Compound to be purified must not be soluble in the solvent at room temperature.
The solvent must be inert to the compound to be purified.
The solvent must have low solubility for compound at lower temperatures and high solubility at a higher temperature.
An abundant amount of crystals must be recovered from the cool solvent.
For effective recrystallization, solubility of organic solids in the solvent should not be too large because it will be difficult to recover the compound.
The solubility of organic solid should not be too small, else a huge volume of solvent will be needed to dissolve the compound.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Ch. 15 - Prob. 1Q Ch. 15 - Prob. 2Q Ch. 15 - Prob. 3Q Ch. 15 - Prob. 4Q Ch. 15 - Prob. 5Q Ch. 15 - Prob. 6Q Ch. 15 - Prob. 7Q

Explanation of Solution

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Chapter 15 Solutions