[Sheryl Mackie]

I need to find the ph and concentrations of H2SO3, HSO3-, SO3 2-, HeO+ and OH- in a .025 M HwSO3 solution.  Any help appreciated.

Sheryl

[Borek]

HeO+ [...] HwSO3

Huh??? Do you mean H₃O⁺ and H₂SO₃?

http://www.chembuddy.com/?left=pH-calculation&right=pH-polyprotic-simplified

pH is defined by the first dissociation step (calculate as for monoprotic weak acid, difference in pK_as is about 5, large enough), rest is simple stoichiometry and clever use of K_a2 and K_w definitions.

Or - if you just interested in result, not in the calculations - follow BATE link from my signature.