The pH of an aqueous solution of CH3COONa of concentrated C(M) is given by

Question

The pH of an aqueous solution of CH3COONa of concentrated C(M) is given by (A) 7-(1/2)pKa-(1/2)log C (B) (1/2)pKw+(1/2)pKb+(1/2)log C (C) (1/2)pKw-(1/2)pKb-(1/2)log C (D) (1/2)pKw+(1/2)pKa+(1/2)log C

Tardigrade Admin · Accepted Answer

CH 3 COONa + H 2 O leftharpoons underset text Weak acid CH 3 COOH + underset textStrong baseNaOH As sodium acetate is a salt of weak acid and strong base, in hydrolysis of sodium acetate the pH is given by pH =(1/2) p Kw+(1/2) p Ka+(1/2) log C

Q. The pH of an aqueous solution of $C H_{3} COON a$ of concentrated $C (M)$ is given by

$7 - \frac{1}{2} p K_{a} - \frac{1}{2} l o g C$

$\frac{1}{2} p K_{w} + \frac{1}{2} p K_{b} + \frac{1}{2} l o g C$

$\frac{1}{2} p K_{w} - \frac{1}{2} p K_{b} - \frac{1}{2} l o g C$

$\frac{1}{2} p K_{w} + \frac{1}{2} p K_{a} + \frac{1}{2} l o g C$

$C H_{3} COON a + H_{2} O ⇌ Weak acid C H_{3} COO H + Strong base N a O H$
As sodium acetate is a salt of weak acid and strong base, in hydrolysis of sodium acetate the $p H$ is given by
$p H = \frac{1}{2} p K_{w} + \frac{1}{2} p K_{a} + \frac{1}{2} lo g C$

Q. The pH of an aqueous solution of CH3​COONa of concentrated C(M) is given by

7−21​pKa​−21​logC

21​pKw​+21​pKb​+21​logC

21​pKw​−21​pKb​−21​logC

21​pKw​+21​pKa​+21​logC