An unknown amount of acid can often be determined by adding an excess of base and then back-titrating the excess. A 0.3471?g sample of a mixture of oxalic acid, which has two ionizable protons, and benzoic acid, which has one, is treated with 95.0 mL of 0.1020 M NaOH. The excess NaOH is titrated with 21.50 mL of 0.2050 M HCl. Find the mass % of benzoic acid.

Question

An unknown amount of acid can often be determined by adding an excess of base and then back-titrating the excess. A 0.3471?g sample of a mixture of oxalic acid, which has two ionizable protons, and benzoic acid, which has one, is treated with 95.0 mL of 0.1020 M NaOH. The excess NaOH is titrated with 21.50 mL of 0.2050 M HCl. Find the mass % of benzoic acid.

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