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The first and second dissociation consta...

The first and second dissociation constants of an acid `H_(2)A` are `1.0xx10^(-5)` and `5.0xx10^(-10)` respectively. The overall dissociation constant of the acids wil be:

A

`5.0xx10^(-16)`

B

`0.2xx10^(5)`

C

`5.0xx10^(-5)`

D

`5.0xx10^(15)`

Text Solution

Verified by Experts

`{:(H_(2)A hArr H^(+)+HA^(-),," ",K_(1)=([H^(+)][HA^(-)])/([H_(2)A])=1xx10^(-6)),(HA^(-)hArr H^(+)+A^(2-),," ",K_(2)=5xx10^(-10)=([H^(+)][H^(2-)])/([HA^(-)])):}`
`K=([H^(+)]^(2)[H^(2-)])/([H_(2)A])=K_(1)xxK_(2)=1xx10^(-5)xx5xx10^(-15)`
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