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Homework Statement
Calculate the molar solubility of Ag2C2O4 (silver oxalate) in a solution that has a fixed H3O+ concentration of 1.0 x 10^-6 M.
Homework Equations
The Attempt at a Solution
I found the pertinent reactions, the charge balance and the mass balance so far, but I don't know what to do next.
Pertinent Reactions
Ag2C2O4(s) → 2Ag+(aq) + C2O4(2-)(aq) Ksp = 5.40 x 10^-12
H2C2O4(aq) + H2O(l) → HC2O4-(aq) + H3O+(aq)
HC2O4-(aq) + H2O(l) →C2O4(2-)(aq) + H30+(aq)
Charge Balance
[Ag+] + [H3O+] = 2[C2O4(2-)] + [HC2O4-]
Mass Balance
[Ag+] = 2[C2O4(2-)]
[Ag+] = 2{[C2O4(2-)] + [HC2O4-] + [H2C2O4]}