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Q.

$HA$ is a weak acid. The $pH$ of $0.1 M HA$ solution is $2 .$ What is the degree of dissociation (a) of $HA$

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a

$0.2$

b

$0.5$

c

$0.301$

d

$0.1$

answer is C.

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Detailed Solution

$pH = 2, ∴ [H^{+}] = 10^{- 2} = 0 .01 .$

For weak acid, $[H^{+}] = α . C$

or, $0 .01 = α \times 0 .1 \Rightarrow α = 0 .1 .$

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HA is a weak acid. The pH of 0.1 M HA solution is 2. What is the degree of dissociation (a) of HA