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Reaction 6-7 is allowed to come to equilibrium in a solution initially containing 0.010

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

Solution for problem 6-B Chapter 6

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 6-B

Reaction 6-7 is allowed to come to equilibrium in a solution initially containing 0.010 0 M BrO 3, 0.010 0 M Cr3, and 1.00 M H. To find the concentrations at equilibrium, we can construct a table showing initial and final concentrations (see below). We use the stoichiometry coefficients of the reaction to say that if x mol of Br are created, then we must also make x mol of Cr2O7 2 and 8x mol of H. To produce x mol of Br, we must have consumed x mol of BrO 3 and 2x mol of Cr3. (a) Write the equilibrium constant expression that you would use to solve for x to find the concentrations at equilibrium. Do not try to solve the equation. (b) Because , we suppose that the reaction will go nearly to completion. That is, we expect both the concentration of Br and Cr2O7 2 to be close to 0.005 00 M at equilibrium. (Why?) That is, x 0.005 00 M. With this value of x, [H] 1.00 8x 1.04 M and [BrO 3 ] 0.010 0 x 0.005 0 M. However, we cannot say [Cr3] 0.010 0 2x 0, because there must be some small concentration of Cr3 at equilibrium. Write [Cr3] for the concentration of Cr3and solve for [Cr3]. The limiting reagent in this example is Cr3. The reaction uses up Cr3 before consuming BrO 3 . K 1 1011 AgCl(s)

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Nomenclature Rules for Coordination Chemistry  In naming complexes that are salts o The name of the cation is given before the name of the anion  In naming complex ions or molecules o The ligands are named before the metal o Ligands are listed in alphabetical order, regardless of their charges  The names of anionic ligands end in the letter “o” the complex is an anion o But electrically neutral ligands ordinarily bear the name of the molecules (exceptions: ammonia, water, CO)  Greek prefixes are used to indicate the number of each kind of ligand when more than one is present  If the complex is an anion, the complex ends in “ate”  The oxidation number of the metal is given in parenthesis in

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Chapter 6, Problem 6-B is Solved
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Textbook: Quantitative Chemical Analysis
Edition: 8
Author: Daniel C. Harris
ISBN: 9781429218153

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Reaction 6-7 is allowed to come to equilibrium in a solution initially containing 0.010