Give equilibrium and equilibrium constant of aqueous solution of `H_2S` which used in analysis ?

Explanation

`H_2S_((aq))+2H_2O_((l)) hArr 2H_3O_((aq))^(+) + S_((aq))^(2-)`
`K_a=([H_3O^+]^2[S^(2-)])/([H_2S])`