First slide

Acidic buffer

Question

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

Moderate

A

1 : 20
B

1 : 10
C

2 : 1
D

20 : 1

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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