First slide

Salt hydrolysis :

Question

The pH of aqueous solution of NH₄CN (K_aof HCN is 9.2 × 10^–10 & K_b of NH₄OH is 1.8 × 10^–5)

Moderate

A

> 7
B

< 7
C

7
D

14

Solution

P^H of a salt of weak acid and weak base is given as
$\large {P^H} = \frac{1}{2}\left[ {{P^{{K_w}}} + {P^{{K_a}}} - {P^{{K_b}}}} \right]$
$\large \Rightarrow {P^H} = \frac{1}{2}\left [ 14+8.05-4.74 \right ]= 8.655$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App