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Chemistry / Quantitative Chemical Analysis 8 / Chapter 15 / Problem 15-26

Quantitative Chemical Analysis | 8th Edition | ISBN: 9781429218153 | Authors: Daniel C. Harris

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A 3.026-g portion of a copper(II) salt was dissolved in a 250-mL volumetric flask. A

Chapter 15, Problem 15-26

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QUESTION:

A 3.026-g portion of a copper\((II)\) salt was dissolved in a 250-mL volumetric flask. A 50.0-mL aliquot was analyzed by adding 1 g of \(Kl\) and titrating the liberated iodine with 23.33 mL of 0.046 68 \(M\) \(\mathrm{Na}_2\mathrm{S}_2\mathrm{O}_3\). Find the weight percent of \(Cu\) in the salt. Should starch indicator be added to this titration at the beginning or just before the end point?

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QUESTION:

A 3.026-g portion of a copper\((II)\) salt was dissolved in a 250-mL volumetric flask. A 50.0-mL aliquot was analyzed by adding 1 g of \(Kl\) and titrating the liberated iodine with 23.33 mL of 0.046 68 \(M\) \(\mathrm{Na}_2\mathrm{S}_2\mathrm{O}_3\). Find the weight percent of \(Cu\) in the salt. Should starch indicator be added to this titration at the beginning or just before the end point?

ANSWER:

Step 1 of 6

The following reactions involved in the titration;

......................(1)

..................(2)

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