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The first and second dissociation cons...

The first and second dissociation constant of an acid `H_2A ` are ` 1.0 xx 10 ^(-5) and 5.0 xx 10^(-10) ` respectively . The overall dissociation constant of the acid will be :
` 5.0 xx 10^(-5)`
` 5.0 xx 10 ^(-15)`
` 5.0 xx 10 ^(-15)`
` 0.2 xx 10 ^(5)`

A

`5.0xx10^(-5)`

B

`5.0xx10^(15)`

C

`5.0xx10^(-15)`

D

`0.2xx10^(5)`

Text Solution

Verified by Experts

The correct Answer is:
C
`K_(a)=K_(a1)xxK_(a2)=5xx10^(-15)`
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