If K_(a_(1)),K_(a_(2)) are the first, second and third ionization constants of H_(2)PO_(4) respectively and K_(a_(1)) gtgt K_(a_(2)) gtgt K_(a_(3)). Which is/are correct:

If K_(a_(1)),K_(a_(2)) are the first, second and third ionization cons

1.	If K_(a_(1)),K_(a_(2)) are the first, second and third ionization constants of H_(2)PO_(4) respectively and K_(a_(1)) gtgt K_(a_(2)) gtgt K_(a_(3)). Which is/are correct:
Answer» `[H^(+)] = sqrt(k_(a_(1))[H_(3)PO_(4)])` `[H^(+)] = [HPO_(4)^(2-)]` `K_(a_(2)) = [HPO_(4)^(2-)]` `K_(a_(1)) = [HPO_(4)^(2-)]` SOLUTION :In CASE of polyprotic acids, divalent ANION concentration is equal to `K_(a_(2))`