Macroscale and Microscale Organic Experiments
7th Edition
ISBN: 9781305577190
Author: Kenneth L. Williamson, Katherine M. Masters
Publisher: Brooks Cole
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Question
Chapter 4, Problem 5Q
Interpretation Introduction
Interpretation:
The circumstances suitable for the use of a mixture of solvents to carry out recrystallization should be determined.
Concept introduction:
Recrystallization is a technique that is used to purify the impure compounds. It is based on the principle that the solubility of substances increases with the increase in temperature.
Following are some of the types of recrystallization:
- Single-solvent recrystallization
- Multi-solvent recrystallization
- Hot filtration-recrystallization
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You have a solution that contains 4.0g of oxalic acid dissolved in 100ml of water. this solution is placed in a separatory funnel, and then 100ml of diethyl ether is added to the separatory funnel and an extraction is performed. (Diethyl ether and water are immiscible solvents.) Use the following constant to calculate how much oxalic acid is in each solvent after extraction.
Solubility of Oxalic acid in water=9.5g/100ml
Solubility of Oxalic acid in ether=16.9g/100ml
In a recrystallization experiment, describe a procedure to solve the following problem:
No crystals are formed when a solution reaches room temperature
2. When performing the recrystallization of an impure solid, why is it advised to use the minimal amount of solvent possible?
Group of answer choices
To minimize the amount of pure solid lost due to its solubility.
To minimize the cost of the recrystallization.
To reduce the time needed to filter the pure solid from the solvent after recrystallization.
To minimize the amount of hazardous materials used.
Chapter 4 Solutions
Macroscale and Microscale Organic Experiments
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