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For diprotic selenous acid (H(2)SeO(3)) ...

For diprotic selenous acid `(H_(2)SeO_(3))` equilibrium constants `K_(a)1` and `K_(a)2` are `3.0xx10^(-3) and 5.0xx10^(-8)` respectively. `[OH – ]` of 0.30 M solution of selenous acid is :

A

`9.6xx10^(-6)`

B

`1.4xx10^(-1)`

C

`1.2xx10^(-6)`

D

`1.3xx10^(-8)`

Text Solution

Verified by Experts

The correct Answer is:
C
The hydrolysis of `C_(2)O_(4)^(2-)` is as follows `C_(2)O_(4)^(2-)+H_(2)O hArr HC_(2)O_(4)^(-)+OH^(-)`
`[OH^(-)]= sqrt((K_(w)xxC)/(K_(2)))= sqrt((10^(-14)xx10^(-2))/(6.1xx10^(-5)))`
`=1.2xx10^(-6)`
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