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Q.

A buffer solution is prepared by mixing CH3COONa and CH3COOH. The pKa of acetic acid is 4.74. To maintain the pH of the buffer solution as 6.04, the concentration ratio of CH3COONa and CH3COOH to be maintained is

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a

1 : 10

b

20 : 1

c

1 : 20

d

2 : 1

answer is D.

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Detailed Solution

PH of an acidic buffer is given as

\large {P^H} = {P^{{K_a}}} + \log \frac{{\left[ {salt} \right]}}{{\left[ {acid} \right]}}
\large \Rightarrow 6.04 = 4.74 + \log \frac{{\left[ {salt} \right]}}{{\left[ {acid} \right]}}
\large \Rightarrow \log \frac{{\left[ {salt} \right]}}{{\left[ {acid} \right]}} = + 1.3
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