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Q.

A buffer solution is prepared by mixing CH₃COONa and CH₃COOH. The pK_a 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 : 20

b

1 : 10

c

2 : 1

d

20 : 1

answer is D.

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Detailed Solution

P^H 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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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