Published by:
CGP EDU Academic Team
Published on: August 13, 2026
On addition of V mL volume of 0.1 M KOH, buffer capacity is found maximum at pH solution = x (> 7), when it is titrated against 50 mL, 0.2 M H 2 CO 3 . (For H 2 CO 3 : 
= 4.3 × 10 –6 , 
= 5.6 × 10 –11 )Report your answer as (V + x) × 0.4, rounding it off to the nearest whole number.
Text Solution
Verified by ExpertsThe correct answer is:
64
(64)
Sol. H 2 CO 3 + KOH ⎯→ KHCO 3 + H 2 O V KOH = 50 mL needed
0.2 M, 50 mL
KOHCO 3 + KOH ⎯→ K 2 CO 3 + H 2 O V KOH = 25 mL needed for mid point
pH = 10.7 is is mid titration point of II nd reaction as pH = 
so it is possible at V KOH = 75 mL.
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