Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Consider the dissociation equilibrium of the following weak acid
If the pKa of the acid is 4 , then the pH of 10 mMHA solution is 
.(Nearest integer)
[Given: The degree of dissociation can be neglected with respect to unity]
Text Solution
Verified by ExpertsThe correct answer is:
3
(3)
For the weak acid dissociation 
with 
We have 
.
For a 
solution where the degree of dissociation is negligible with respect to unity, the concentration of HA remains approximately 0.01 M.
The equilibrium expression gives
Substituting: 
, which yields 
, so 
.
Therefore, 
.
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