A diprotic acid solution H2A has a molarity of 0.65 M.The concentrations of the species present at equilibrium are asfollows:
[H+]=0.25 M
[HA-]=0.25
[A2-]=4.6 x 10-4 M
The second ionization constant (Ka2) for this acid is4.6 x 10-4
What is the concentration of H2A remaining in solution? (It's a weak diprotic acid)