First slide

Salt hydrolysis :

Question

The hydrolysis constant of NaX (K_a of HX is 2 × 10^–6) is

Easy

A

5 x 10^-9
B

2x10^-10
C

2 x 10^-6
D

10^-7

Solution

$X^{-} + H_{2} O ⇌ HX + {OH}^{-} K_{h} = {(K_{b})}_{X^{-}} = \frac{K_{w}}{{(K_{a})}_{HX}} = \frac{10^{- 14}}{2 \times 10^{- 6}} = 5 \times 10^{- 9}$

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