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A solid substance A is soluble in water to the extent of 10 mg/mL of water at 25 °C and 100 mg/mL of water at 100 °C. You have a sample that contains 100 mg of A and an impurity B. a. Assuming that 2 mg of B is present along with 100 mg of A, describe how you could purify A if B is completely insoluble in water. b. Assume that 2 mg of the impurity B is present along with 100 mg of A, describe how you could purify A if B had the same solubility behavior as A. Would one crystallization produce pure A?

A solid substance A is soluble in water to the extent of 10 mg/mL of water at 25 °C and 100 mg/mL of water at 100 °C. You have a sample that contains 100 mg of A and an impurity B. a. Assuming that 2 mg of B is present along with 100 mg of A, describe how you could purify A if B is completely insoluble in water. b. Assume that 2 mg of the impurity B is present along with 100 mg of A, describe how you could purify A if B had the same solubility behavior as A. Would one crystallization produce pure A?

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter24: Biochemistry
Section: Chapter Questions
Problem 36IL: Insulin is a protein important in the metabolism of sugar. Its molar mass can be determined by means...
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A solid substance A is soluble in water to the extent of 10 mg/mL of water at 25 °C and 100 mg/mL of water at 100 °C. You have a sample that contains 100 mg of A and an impurity B. a. Assuming that 2 mg of B is present along with 100 mg of A, describe how you could purify A if B is completely insoluble in water. b. Assume that 2 mg of the impurity B is present along with 100 mg of A, describe how you could purify A if B had the same solubility behavior as A. Would one crystallization produce pure A?
Transcribed Image Text:A solid substance A is soluble in water to the extent of 10 mg/mL of water at 25 °C and 100 mg/mL of water at 100 °C. You have a sample that contains 100 mg of A and an impurity B. a. Assuming that 2 mg of B is present along with 100 mg of A, describe how you could purify A if B is completely insoluble in water. b. Assume that 2 mg of the impurity B is present along with 100 mg of A, describe how you could purify A if B had the same solubility behavior as A. Would one crystallization produce pure A?
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