A student adds 0.1 mol of oxalic acid and 0.1 mol of sodium dihydrogen phosphate to enough water to make 1.0 L of solution. The following equilibrium is established with the concentrations of the products greater than the concentrations of the reactants. Which of the statements about the equilibrium system is correct? H2C2O4(aq) + H2PO4-(aq) HC2O4-(aq) + H3PO4(aq)
A) Oxalic acid is a weaker acid than phosphoric acid.
B) The hydrogen oxalate anion, HC2O4-, is a stronger base than the dihydrogen phosphate anion, H2PO4-.
C) Phosphoric acid is a weaker acid than oxalic acid.
D) The dihydrogen phosphate anion, H2PO4-, is a stronger acid than oxalic acid.
E) Water is a stronger acid than either oxalic or phosphoric acids.
Correct Answer:
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