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Question

The hydrolysis constant of NH4Cl is 4×1010. Find the pH of 0.1 molar solution of NH4Cl at equilibrium at 25C.

A
3.13
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B
7
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C
5.24
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D
8.95
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Solution

The correct option is A 3.13
Given, Kh=4×1010,[NH4Cl]=0.1 M
NH4Cl is a mixture of strong acid and weak base
we know the relation
Kh=KwKb
4×1010=1014Kb
Kb=2.5×105
pKb=log Kb
=log 2.5×105
=62×0.7
=4.6
Also, pH=12×(pKwpKblog c)
pH=12×(144.6log 0.1)

pH=5.2

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