Equilibrium Question 400

Question: Components of buffer solution are $ 0.1,M,HCN $ and $ 0.2,M,NaCN $ . What is the pH of the solution [RPET 2000]

Options:

A) 9.61

B) 6.15

C) 2.0

D) 4.2

Show Answer

Answer:

Correct Answer: A

Solution:

pH = p $ K_{a} $ + log $ [ \frac{salt}{acid} ] $ = $ 9.30 $ + log $ [ \frac{0.2}{0.1} ] $ = 9.30 + 0.3010 = 9.6.



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