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.
