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Question

For a ammonium chloride solution in water, the given equilibrium reaction occur:
NH+4 (aq)+H2O (l)hydrolysisNH4OH (aq)+H+ (aq)
Which of the following describes correct relation ?

A
Kh=KwKb
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B
Kh=Kw×Kb
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C
Kh=KbKw
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D
None of the above
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Solution

The correct option is A Kh=KwKb

NH+4(aq)+H2O(l)NH4OH(aq)+H+(aq)

C 0 0 CCh Ch Ch

In this reaction the (Kh) hydrolysis constant is:

Kh=[NH4OH][H+][NH+4]=(Ch)2C(1h)

NH4OH(aq)NH+4(aq)+OH(aq)

In this reaction the Kb constant is:

Kb=[NH+4][OH][NH4OH]

H2O(l)H+(aq)+OH(aq)

In this reaction the Kw constant is:

Kw=[H+][OH]

Using he value of Kb and Kw we can derive the value of Kh

KwKb=[H+][OH][NH4][OH][NH4OH]

KwKb=[NH4OH][H+]NH+4

Kh=KwKb


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