an unknown amount of acid can often be determined by adding an
excess of base and...
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an unknown amount of acid can often be determined by adding anexcess of base and then back-titrating the excess. A 0.3471 gsample of a mixture of oxalic acid, which has two ionizableprotons, and benzoic acid which has one, is treated with 91.0 mL of0.1010 M NaOH. The excess NaOH is titrated with 21.50 mL of 0.2060M HCl. Find the mass % of benzoic acid
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moles of HCl in 215ml of 02060M 0206021510000004429 moles Excess of mole of NaOH 0004429 moles moles of NaOH used 0191100000091 moles NaOH consumed 000910004429 0004671 moles let x moles of NaOH is consumed for oxalic acid
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