pH of a salt of a strong base with weak acid

Question

pH of a salt of a strong base with weak acid (A) pH =(1/2) pK w +(1/2) pK a +(1/2) log C (B) pH =(1/2) pK w -(1/2) pK a -(1/2) log C (C) pH =(1/2) pK w +(1/2) pK a -(1/2) log C (D) None of these

Tardigrade Admin · Accepted Answer

For salt of a strong base with weak acid, pH =(1/2) pK w +(1/2) pK a (1/2) log C =7+(1/2) pK a +(1/2) log C

Q. $p H$ of a salt of a strong base with weak acid

$p H = \frac{1}{2} p K_{w} + \frac{1}{2} p K_{a} + \frac{1}{2} lo g C$

$p H = \frac{1}{2} p K_{w} - \frac{1}{2} p K_{a} - \frac{1}{2} lo g C$

$p H = \frac{1}{2} p K_{w} + \frac{1}{2} p K_{a} - \frac{1}{2} lo g C$

None of these

For salt of a strong base with weak acid,
$p H = \frac{1}{2} p K_{w} + \frac{1}{2} p K_{a} \frac{1}{2} lo g C$
$= 7 + \frac{1}{2} p K_{a} + \frac{1}{2} lo g C$

Q. pH of a salt of a strong base with weak acid

pH=21​pKw​+21​pKa​+21​logC

pH=21​pKw​−21​pKa​−21​logC

pH=21​pKw​+21​pKa​−21​logC