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Q.

HCOOH and CH3COOH solution have equal pH. If K1K2 (ratio of acid ionisation constants) is 4, their molar concentration ratio will be

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a

2

b

0.25

c

0.5

d

4

answer is D.

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Detailed Solution

Equal pH means H+1=H+2

K1C1=K2C2 (by Ostwald's dilution law)  or K1C1=K2C2 ∴ C1C2=K2K1=14=0.25

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