Equilibrium Question 357

Question: 0.2 molar solution of formic acid is ionized 3.2%. Its ionization constant is [MP PMT 1991]

Options:

A) $ 1\times {10^{-12}} $

B) $ 2.1\times {10^{-4}} $

C) $ 1.25\times {10^{-6}} $

D) $ 1\times {10^{-14}} $

Show Answer

Answer:

Correct Answer: B

Solution:

$ K_{a}=C{{\alpha }^{2}}=0.2\times {{( \frac{32}{100} )}^{2}}=2.048\times {10^{-4}} $ .



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