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STATEMENT-1: pH of water decreases with ...

STATEMENT-1: pH of water decreases with increase in temperature.
STATEMENT-2 : `K_(w)` of water decreases with increase in temperature.

A

Statement-1 is True, Statement-2 is True , Statement-2 is the correct explanation of Statement - 1 .

B

Statement-1 is True, Statement - 2 is True , Statement-2 is NOT a correct explanation for Statement-1.

C

Statement-1 is True, Statement-2 is False.

D

Statement-1 is False, Statement-2 is True.

Text Solution

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The correct Answer is:
D
Correct statement-1. pH of water decreases with increase in temperature.
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Assertion (A): pH of water increases with an increase in temperature. Reason (R) : K_(w) or water increases with increase in temperature.

Each question contains STATEMENTS-1 (Assertion) and STATEMENT -2 (Reason). Examine the statements carefully and mark the correct answer according to the instructions given below: STATEMENT-1: For exothermic reaction equilibrium constant decrease with increase in temperature. STATEMETN-2: For exothermic reaction rate constant decrease with decrease in temperature.

the solubility of CO_(2) in water decreases with increases in temperature . Explain.

Why dows physisoption decrease with increase of temperature ?

The dissociation of weak electrolyte (a weak base or weak acid) is expressed in terms of Ostwald's dilution law. An acid is substance which furnishes a proton or accepts an electron pair, where a base is proton acceptor or electron pair donor. Stronger is acid, weaker is its conjugate base. The dissociation constants of an acid (K_(a)) and its conjugate base (K_(b)) are related by K_(w)=K_(a)xxK_(b) , where K_(w) is ionic product of water equal to 10^(-14) at 25^(@)C . The numerical value of K_(w) however increase with temperature. In a solution of an acid or base [H^(+)][OH^(-)]=10^(-14) . Thus the [H^(+)] in a solution is expressed as: [H^(+)]=10^(-pH) and pH+pOH=14 . Buffer solution are the solutions which do not show appreciable change in the pH on addition of small amount of acid or base. Which of the following statements are wrong ? (1) Increase in temperature has no effect on neutral nature of water. (2) Increase in temperature of pure water decreases its pH. (3) Increase in temperature of pure water decreases its autoprolysis. (4) Increase in temperature of pure increase its ionic product. (5) Increase in temperature of pure water decreaseas degree of dissociation of water.

With increases in temperature pH of pure water

The dissociation of weak electrolyte (a weak base or weak acid) id expressed in terms of Ostwald dilution law. An acid is a substance which furnishes a proton or accepts an electron pair whereas a base is proton acceptor or electron pair donor. Storonger is the acid weaker is its conjugate base. The dissociation constants of an acid (K_(a)) and its conjugate base are related by (K_(w)=K_(a)xxK_(b) , where K_(w) is ionic prodcut of water equal to 10-14 at 25^(@) C. The numerical value of K_(w) however increases with temperature. In a solution of an acid or base [H^(+)][OH^(-)]=10^(14) .Thus, the [H^(+)] in a solution is expressed as : [H^(+)]=10^(-pH) and pH+pOH=14 . Buffer solutions are the solutions which do not show appreciable change in the pH on addition of small amount of acid or base. (Q) Increase in temperature of pure water decreases its pH. (R) Increase in temperature of pure water decreases its autoprotolysis. (S) Increase in temperature of pure water increases its ionic product. (T) Increase in temperature of pure water decreases degree of dissociation of water.

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