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Chemistry / Principles of General Chemistry 2 / Chapter 4 / Problem 46P

Principles of General Chemistry | 2nd Edition | ISBN: 9780073511085 | Authors: Martin S. Silberberg

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Chapter 4, Problem 46P

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QUESTION: Problem 46P

An unknown amount of acid can often be determined bv 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 100.0 mL of 0.1000M NaOH. The excess NaOH is titrated with 20.00 mL of 0.2000 M HC1. Find the mass % of benzoic acid.

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QUESTION: Problem 46P

An unknown amount of acid can often be determined bv 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 100.0 mL of 0.1000M NaOH. The excess NaOH is titrated with 20.00 mL of 0.2000 M HC1. Find the mass % of benzoic acid.

ANSWER:

Problem 46P

An unknown amount of acid can often be determined bv 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 100.0 mL of 0.1000M NaOH. The excess NaOH is titrated with 20.00 mL of 0.2000 M HC1. Find the mass % of benzoic acid.

Solution 46P

Here, we have to calculate the mass % of benzoic acid.

Step 1

First, let’s write the chemical reactions between the given rectants.

2 NaOH (aq) + H2C2O4 (aq) $\rightarrow{}$ 2H2O (aq) + Na2C2O4(aq) ……………….(1)

NaOH (aq) + C6H5COOH (aq) $\rightarrow{}$ H2O(aq) + C6H5COONa(aq)....................(2)

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