Equilibrium Question 825

Question: For preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be $ (K_{a}={10^{-5}}) $

Options:

A) 1:10

B) 10:1

C) 100:1

D) 1:100

Show Answer

Answer:

Correct Answer: B

Solution:

$ 6=-log{10^{-5}}+log\frac{salt}{acid}=5+log\frac{salt}{acid} $

$ \log \frac{salt}{acid} $ must be1.
$ \therefore \frac{salt}{acid}=\frac{10}{1},or,10:1. $



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