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Q.

The composition of an acidic buffer mixture made up of HA and NaA of total molarity 0.29 (having pH = 4.4 and
$K_{a} = 1.8 \times 10^{- 5})$ in terms of concentration of salt and acid respectively is :

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a

0.09 M and 0.20 M

b

0.20 M and 0.09

c

0.1 M and 0.19 M

d

0.19 M and 0.1 M

answer is A.

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Detailed Solution

For buffer solution,

$pH = - \log K_{a} + \log \frac{[Conjugate base]}{[Acid]}$

$4.4 = - \log 1.8 \times 10^{- 5} + \log \frac{a}{(0.29 - a)} a = 0.09$

So salt is 0.09M.

Here, acid = $0.29 - 0.09 = 0.20 M$

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The composition of an acidic buffer mixture made up of HA and NaA of total molarity 0.29 (having pH = 4.4 andKa=1.8×10−5 in terms of concentration of salt and acid respectively is :