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Chapter 24: Problem 8

Addition of KCI to phenol-water system (a) raises the CST (b) lower the CST (c) has no effect on CST (d) none of the above

Short Answer

Expert verified
The correct answer is (b) lower the CST, as adding KCl to the phenol-water system would enhance the solubility of the solute, thereby requiring a lower temperature for complete miscibility, which signifies lowering of CST.

Step by step solution

01

Understanding Salts effect on Solubility

Salts like KCl usually increase the solubility of organic compounds in water. This is due to 'salting in' effect. So, the first step is recognizing that the addition of KCl can alter the solubilities.
02

Comparing Solubility with Critical Solution Temperature

The CST is the temperature limit above which the two immiscible liquids (phenol and water here) become miscible with each other. If 'salting in' causes an increase in solubility, it impacts the CST. Hence, adding KCl would influence the temperature at which phenol and water mix freely.
03

Analyzing the Effect of KCl on CST

Given that the addition of KCl to the phenol-water system enhances solubility, it would consequently lower the CST, since a lower temperature would now be required to facilitate complete miscibility.

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Most popular questions from this chapter

Mathematical form of Henry's law is (a) \(m=k_{p}\) (b) \(p=k_{m}\) (c) \(\mu \frac{k}{m}\) (d) \(m \frac{1}{k} p\)

The vapour phase is relatively richer in the component whose addition to the liquid mixture results in an increase of total vapour pressure. This is the statement of (a) Duhem-Margules law (b) Raoult's law (c) Konowaloff's rule (d) none of the above

Triethylamine-water system is an example of (a) upper CST (b) lower CST (c) upper as well as lower CST (d) none of the above

Which of the following is not true about the applicability of steam distillation? (a) The organic liquid to be purified should be immiscible with water. (b) It should have high molecular weight. (c) It should have high vapour pressure. (d) The impurities present should be volatile.

A solution formed on mixing of two liquids is ideal if (a) \(\Delta V_{\operatorname{mix}}=0, \Delta H_{\operatorname{mix}} \neq 0\) (b) \(\Delta V_{\operatorname{mix}} \neq 0, \Delta H_{\operatorname{mix}}=0\) (c) \(\Delta V_{\operatorname{mix}}=0, \Delta H_{\operatorname{mix}}=0\) (d) \(\Delta V_{\operatorname{mix}}=0, \Delta H_{\operatorname{mix}} \neq 0\)
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