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H(2)A is a weak diprotic acid. If the pH...

`H_(2)`A is a weak diprotic acid. If the pH of 0.1 M `H_(2)A` solution is 3 and concentration of `A^(2-)` is `10^(-12)` at `25^(@)C.`
Select correct statement (s)

A

`[H^(+)]_("total")~~[H^(+)]` from first step of ionization of acid `H_(2)A`

B

Concentration of `OH^(-)` in solution is `10^(-3)` M

C

The value of `K_(a_1)` is nearly `10^(-5)`

D

`pK_(a_2)-pK_(a_1)=9`

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