Will the sample be contaminated with any of the impurities? Calculate the percent purity of the initial sample (in terms of compound A) ( i.e. express the amount of compound A in the initial sample as a percentage of the mass of initial sample). Calculate the percent purity of the final sample (in terms of compound A) - (i.e. express the amount of compound A in the final sample as a percentage of the mass of final sample). Did the recrystallization procedure result in an increase of the percent purity of compound A in the sample? Comment on the results.
Will the sample be contaminated with any of the impurities? Calculate the percent purity of the initial sample (in terms of compound A) ( i.e. express the amount of compound A in the initial sample as a percentage of the mass of initial sample). Calculate the percent purity of the final sample (in terms of compound A) - (i.e. express the amount of compound A in the final sample as a percentage of the mass of final sample). Did the recrystallization procedure result in an increase of the percent purity of compound A in the sample? Comment on the results.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![b) Will the sample be contaminated with any of the impurities?
Calculate the percent purity of the initial sample (in terms of compound A) - ( i.e.
express the amount of compound A in the initial sample as a percentage of the
mass of initial sample).
Calculate the percent purity of the final sample (in terms of compound A) - (i.e.
express the amount of compound A in the final sample as a percentage of the
mass of final sample).
Did the recrystallization procedure result in an increase of the percent purity of
compound A in the sample? Comment on the results.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5642b5d0-5e15-499a-8121-299a6d410766%2F44c736c6-c6ae-40eb-af77-148b77101f24%2F8wma2qa_processed.jpeg&w=3840&q=75)
Transcribed Image Text:b) Will the sample be contaminated with any of the impurities?
Calculate the percent purity of the initial sample (in terms of compound A) - ( i.e.
express the amount of compound A in the initial sample as a percentage of the
mass of initial sample).
Calculate the percent purity of the final sample (in terms of compound A) - (i.e.
express the amount of compound A in the final sample as a percentage of the
mass of final sample).
Did the recrystallization procedure result in an increase of the percent purity of
compound A in the sample? Comment on the results.
![1. An impure sample of compound A is contaminated with two impurities B and C. The sample is to
be purified by recrystallization using ethanol as the solvent. The solubility properties of the three
components are summarized below.
Solubility in
Solubility in ethanol Solubility in 50 mL
Solubility in 50 mL
ethanol at -78 °C
at - 0°C
ethanol at -78 °C
ethanol at - 0°C
(g)
(g)
Compound A
0.12 g/mL
0.02 g/mL
Impurity B
0.58 g/mL
0.04 g/mL
Impurity C
0.005 g/mL
0.0003 g/mL
The impure (7.5 g) sample contains 5.0 g of compound A, 1.5 g of B and 1.0 g of C and is
recrystallized using 50 mL of ethanol. The sample is boiled with 50 mL of ethanol, filtered by
gravity and then cooled in ice and filtered by suction.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5642b5d0-5e15-499a-8121-299a6d410766%2F44c736c6-c6ae-40eb-af77-148b77101f24%2Fgpifuks_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1. An impure sample of compound A is contaminated with two impurities B and C. The sample is to
be purified by recrystallization using ethanol as the solvent. The solubility properties of the three
components are summarized below.
Solubility in
Solubility in ethanol Solubility in 50 mL
Solubility in 50 mL
ethanol at -78 °C
at - 0°C
ethanol at -78 °C
ethanol at - 0°C
(g)
(g)
Compound A
0.12 g/mL
0.02 g/mL
Impurity B
0.58 g/mL
0.04 g/mL
Impurity C
0.005 g/mL
0.0003 g/mL
The impure (7.5 g) sample contains 5.0 g of compound A, 1.5 g of B and 1.0 g of C and is
recrystallized using 50 mL of ethanol. The sample is boiled with 50 mL of ethanol, filtered by
gravity and then cooled in ice and filtered by suction.
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