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Pyrocatechol violet (Table 11-3) is to be used as a metal ion indicator in an EDTA

Quantitative Chemical Analysis | 8th Edition | ISBN: 9781429218153 | Authors: Daniel C. Harris ISBN: 9781429218153 475

Solution for problem 11-26 Chapter 11

Quantitative Chemical Analysis | 8th Edition

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

Quantitative Chemical Analysis | 8th Edition

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Problem 11-26

Pyrocatechol violet (Table 11-3) is to be used as a metal ion indicator in an EDTA titration. The procedure is as follows: 1. Add a known excess of EDTA to the unknown metal ion. 2. Adjust the pH with a suitable buffer. 3. Back-titrate the excess chelate with standard Al3. From the following available buffers, select the best buffer, and then state what color change will be observed at the end point. Explain your answer. (a) pH 67 (b) pH 78 (c) pH 89 (d) pH 910

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CHM 170 Exam 5 Study Guide Electrochemistry is the branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions. Assigning oxidation numbers: Fe 2 3 3CO ------- 2Fe + 3CO 2 3+ (Fe 2 (These elements balance each other) (O ) 6- (Oxygen usually has a charge of -2. 2*3=6) 3 (O) 2- (See above) 2+ (3C) (These elements must balance each other out) (2Fe) 0 (Elemental form has no charge) (3C) 4+ (See above) 4- (O 2 (See above) The Half Reaction Method in an acidic medium (As demonstrated by this equation) 2- 2- 3+ SO 2 Cr O 2 7 ------------- SO4 + Cr First assign oxidation values: +4 -2

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Chapter 11, Problem 11-26 is Solved
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Textbook: Quantitative Chemical Analysis
Edition: 8
Author: Daniel C. Harris
ISBN: 9781429218153

Since the solution to 11-26 from 11 chapter was answered, more than 227 students have viewed the full step-by-step answer. The answer to “Pyrocatechol violet (Table 11-3) is to be used as a metal ion indicator in an EDTA titration. The procedure is as follows: 1. Add a known excess of EDTA to the unknown metal ion. 2. Adjust the pH with a suitable buffer. 3. Back-titrate the excess chelate with standard Al3. From the following available buffers, select the best buffer, and then state what color change will be observed at the end point. Explain your answer. (a) pH 67 (b) pH 78 (c) pH 89 (d) pH 910” is broken down into a number of easy to follow steps, and 87 words. The full step-by-step solution to problem: 11-26 from chapter: 11 was answered by , our top Chemistry solution expert on 03/16/18, 04:33PM. This textbook survival guide was created for the textbook: Quantitative Chemical Analysis, edition: 8. This full solution covers the following key subjects: . This expansive textbook survival guide covers 55 chapters, and 1224 solutions. Quantitative Chemical Analysis was written by and is associated to the ISBN: 9781429218153.

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Pyrocatechol violet (Table 11-3) is to be used as a metal ion indicator in an EDTA