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

Solution for problem 15-35 Chapter 15

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 15-35

Warning! The Surgeon General has determined that this problem is hazardous to your health.The oxidation numbers of Cu and Bi in high-temperature superconductors of the type Bi2Sr2(Ca0.8Y0.2)Cu2Ox (which could contain Cu2, Cu3, Bi3, and Bi5) can be measured by the following procedure.34 In Experiment A, the superconductor is dissolved in 1 M HCl containing excess 2 mM CuCl. Bi5 (written as BiO3 ) and Cu3 consume Cu to make Cu2: (1) Cu (2) 3 Cu S 2Cu2 BiO3 2Cu 4H S BiO 2Cu2 2H2O Co3 Fe2 S Co2 Fe3 360 The excess, unreacted Cu is then titrated by coulometry (described in Chapter 16). In Experiment B, the superconductor is dissolved in 1 M HCl containing excess 1 mM FeCl2 4H2O. Bi5 reacts with the Fe2 but Cu3 does not react with Fe2. 35 (3) (4) The excess, unreacted Fe2 is then titrated by coulometry. The total oxidation number of Cu Bi is measured in Experiment A, and the oxidation number of Bi is determined in Experiment B. The difference gives the oxidation number of Cu. (a) In Experiment A, a sample of Bi2Sr2CaCu2Ox (FM 760.37 15.999 4x) (containing no yttrium) weighing 102.3 mg was dissolved in 100.0 mL of 1 M HCl containing 2.000 mM CuCl. After reaction with the superconductor, coulometry detected 0.108 5 mmol of unreacted Cu in the solution. In Experiment B, 94.6 mg of superconductor were dissolved in 100.0 mL of 1 M HCl containing 1.000 mM FeCl2 4H2O. After reaction with the superconductor, coulometry detected 0.057 7 mmol of unreacted Fe2. Find the average oxidation numbers of Bi and Cu in the superconductor and the oxygen stoichiometry coefficient, x. (b) Find the uncertainties in the oxidation numbers and x if the quantities in Experiment A are 102.3 ( 0.2) mg and 0.108 5 ( 0.000 7) mmol and the quantities in Experiment B are 94.6 ( 0.2) mg and 0.057 7 ( 0.000 7) mmol. Assume negligible uncertainty in other quantities. Cu3 1 2 H2O S Cu2 1 4 O2

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CHE102 Week 4 Notes Molecularity of elementary reactions: determined by the number of molecules present  unimolecular: Involving a single molecule  bimolecular: Involving two molecules  Termolecular: involving three molecules Energy is released to form bonds, energy is absorbed to break bonds Reaction Profile: Lecture 7: Chemical equilibrium=dynamic equilibrium: rates of opposing reactions or processes are equal Properties of equilibrium constants: 1 Law of mass action holds regardless of mechanism 2 Overall reactions, which are sum of sequential steps: K ca+b)=K (acxK (b)c 1 Reverse reactions: K creverse)=1/K (focward) 1 Reactions multiplied by a number n K c

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Chapter 15, Problem 15-35 is Solved
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Textbook: Quantitative Chemical Analysis
Edition: 8
Author: Daniel C. Harris
ISBN: 9781429218153

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