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HA is a weak acid. The pH of 0.1 M HA s...

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

A

0.5

B

0.2

C

0.1

D

0.301

Text Solution

Verified by Experts

The correct Answer is:
C
`pH=1/2(pK_(a)-logC)`
`2= ½ (pK_(a) +1) implies K_(a)=10^(-3) implies alpha=sqrt(K_(a)/C)=0.1`
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