What will be the effect of adding 10 –3 M HCl solution to a…

Chemistry Ionic Equilibrium General Single Correct MCQ

Published on: August 13, 2026

What will be the effect of adding 10 –3 M HCl solution to a solution of HA having concentration 0.1 M ? (K a of HA = 10 –5 )

Both degree of dissociation of HA and pH will decrease.

Degree of dissociation of HA will decrease but pH of solution will remain constant.

Effect on degree of dissociation of HA and pH of solution can be predicted only by knowing the volumes of both solutions.

Neither pH nor degree of dissociation of HA will change.

Text Solution

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The correct answer is:

[H + ] from HCl = 10 –3 M & [H + ] from HA = = 10 –3 M.

So, addition of HCl will not exert common ion effect on HA.

So, neither pH nor degree of dissociation of HA will change.

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