Equilibrium Question 800

Question: At a certain temperature the dissociation constants of formic acid and acetic acid are $ 1.8\times {10^{-4}} $ and $ 1.8\times {10^{-6}} $ respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in 0.001 M formic acid solution is equal to

Options:

A) 0.001 M

B) 0.01 M

C) 0.1M

D) 0.0001 M

Show Answer

Answer:

Correct Answer: B

Solution:

$ [{H^{+}}]=\sqrt{C\times K_{a}}=\sqrt{0.001\times 1.8\times {10^{-4}}} $ for formic acid $ [{H^{+}}]=\sqrt{C_2\times 1.8\times {10^{-5}}} $ for acetic acid Equating and solving, $ C_2=0.01,M. $



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