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Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter20: Chemistry Of Selected Transition Elements And Coordination Compounds
Section20.5: Chromium
Problem 20.5PSP: At what pH does Ecell = 0.00 V for the reduction of dichromate by iodide ion in acid solution,...
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3) Chromium can be electroplated from aqueous potassium dichromate, with the
reduction shown below. If a current of 6.0A and a voltage of 4.5V are used:
Cr207 (aq)
2-
+ 14H* (ag)+ 12e¯ → 2Cr(s) + 7H20
a) How many hours would it take to completely convert
215mL of 1.25M K,Cr,O, to elemental chromium?
b) How many kilowatt-hours of electrical energy are
required to plate 1.00 g of chromium?
Transcribed Image Text:3) Chromium can be electroplated from aqueous potassium dichromate, with the reduction shown below. If a current of 6.0A and a voltage of 4.5V are used: Cr207 (aq) 2- + 14H* (ag)+ 12e¯ → 2Cr(s) + 7H20 a) How many hours would it take to completely convert 215mL of 1.25M K,Cr,O, to elemental chromium? b) How many kilowatt-hours of electrical energy are required to plate 1.00 g of chromium?
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