LABORATORY TECHNIQUES IN ORGANIC CHEMIS
4th Edition
ISBN: 2819260096009
Author: Mohrig
Publisher: MPS PUB
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Chapter 15, Problem 7Q
Interpretation Introduction
Interpretation:
The reason for methanol and pentane to be an awkward solvent pair should be determined.
Concept introduction:
Recrystallization is a process in which an impure crystalline solid dissolved in hot solvent precipitates back when the solvent is cooled and that leads to formation of pure solid crystals. For successful recrystallization, maximum solubility of solute in hot solvent is essential and in cold solvent the solubility should be minimum for the maximum yield of crystals.
If solute will have good solubility in cold solvent, there will be loss of compound on recrystallization. To minimize this loss, the choice of the solvent for recrystallization is important.
When a solute is dissolved in an appropriate solvent at an appropriate rate, temperature and concentration then it results in the formation of perfect crystal.
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Using the general properties of equilibrium constants
At a certain temperature, the equilibrium constant K for the following reaction is 1.3 × 10 4:
Cl2(g) + CHCl3(g) HCl(g) + CC₁(g)
Use this information to complete the following table.
Suppose a 16. L reaction vessel is filled with 1.6 mol of HCI and
1.6 mol of CCl4. What can you say about the composition of the
mixture in the vessel at equilibrium?
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☐ x10
There will be very little HCI and CCl4.
Neither of the above is true.
What is the equilibrium constant for the following reaction? Be
sure your answer has the correct number of significant digits.
HCl(g)+CC14(g)
12
Cl2(9)+CHCl3(9)
K = 0 ☐
What is the equilibrium constant for the following reaction? Be
sure your answer has the correct number of significant digits.
2 Cl₂(9)+2CHCl3(9)
2 HCl(9)+2CC₁₁(9)
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✓
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18
Ar
Chapter 15 Solutions
LABORATORY TECHNIQUES IN ORGANIC CHEMIS
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