We’re being asked to calculate the equilibrium concentration of HC2O4- in a 0.20 M solution of oxalic acid. Oxalic acid is a diprotic acid, it can donate two protons (H+) and it will have two equilibrium reactions.
Ka1 = 5.9x10-2
• 1st equilibrium reaction: H2C2O4(aq) + H2O(l) → HC2O4-(aq) + H3O+(aq)
Ka2 = 6.4x10-5
• 2nd equilibrium reaction: HC2O4-(aq) + H2O(l) → C2O4-(aq) + H3O+(aq)
Many household cleaning products contain oxalic acid, H2C2O4, a diprotic acid with the following dissociation constants: Ka1 = 5.9x10-2, Ka2 = 6.4x10-5
Calculate the equilibrium concentration of HC2O4- in a 0.20 M solution of oxalic acid.
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