A student adds 0.1 mol of oxalic acid and 0.1 mol of sodium dihydrogen phosphate

Question

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 statements about the equilibrium system is correct?H_2 C_2 O_4 (aq) + H_2 PO_4^- (aq) HC_2 O_4^- (aq) + H_3 PO_4 (aq) Oxalic acid is a weaker acid than phosphoric acid. The hydrogen oxalate anion, HC_2 O_4^-, is a stronger base than the dihydrogen phosphate anion, H_2 PO_4^-. Phosphoric acid is a weaker acid than oxalic acid. T he dihydrogen phosphate anion, H_2 PO_4^-, is a stronger acid than oxalic acid. Water is a stronger acid than either oxalic or phosphoric acids.

Explanation / Answer

Answer is C: Phosphoric acid is a weaker acid than oxalic acid

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