A manufacturer wants to generate chromium plate, but had only potassium dichromate as a reagent to start with. An acidic solution of potassium dichromate can be reduced to chromium(III), which can be further reduced for plating according to the reactions below. Cr203- + 14H* + 6e¯ → 2Cr³+ + 7H2O Cr3+ + 3e → Cr How many electrons are transferred to produce ONE chromium atom during the combined processes? [?]e / Cr atom Number of Electrons Enter

A manufacturer wants to generate chromium plate, but had only potassium dichromate as a reagent to start with. An acidic solution of potassium dichromate can be reduced to chromium(III), which can be further reduced for plating according to the reactions below. Cr203- + 14H* + 6e¯ → 2Cr³+ + 7H2O Cr3+ + 3e → Cr How many electrons are transferred to produce ONE chromium atom during the combined processes? [?]e / Cr atom Number of Electrons Enter

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter33: Automated Methods Of Analysis

Section: Chapter Questions

Problem 33.3QAP

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The thickness of the chromium plate on an auto fender is determined by dissolving a 30.0-cm2 section in acid and oxidizing Cr3+ to Cr2O7 2-with peroxydisulfate. After removing excess peroxydisulfate by boiling, 500.0 mg of Fe(NH4 )2 (SO4 )2•6H2O is added, reducing the Cr2O7 2- to Cr3+ . The excess Fe2+ is back titrated, requiring 18.29 mL of 0.00389 M K2Cr2O7 to reach the end point. Determine the average thickness of the chromium plate given that the density of Cr is 7.20 g/cm3 . Note: thickness = volume /area
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