An unknown amount of acid can often be determined byadding an excess of base and then “back-titrating” the excess. A 0.3471-g sample of a mixture of oxalic acid, which has two ion-izable protons, and benzoic acid, which has one, is treated with100.0 mL of 0.1000 M NaOH. The excess NaOH is titrated with20.00 mL of 0.2000 M HCl. Find the mass % of benzoic acid.

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.