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The first and second dissociation consta...

The first and second dissociation constants of an acid, `H_(2)A` are `1.0 xx 10^(-5)` and `5.0 xx 10^(-15)` respectively. The overall dissociation constant of the acid will be :

A

`0.2 xx 10^(5)`

B

`5.0 xx 10^(-5)`

C

`5.0 xx 10^(-20)`

D

`5.0 xx 10^(15)`

Text Solution

Verified by Experts

The correct Answer is:
C
`K_(a) = K_(a1) xx K_(a2) = 1 xx 10^(-5) xx 5 xx 10^(-10) = 5 xx 10^(-15)`
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