Chemistry with Access Code, Hybrid Edition
9th Edition
ISBN: 9781285188492
Author: Steven S. Zumdahl
Publisher: CENGAGE L
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Chapter 4, Problem 109AE
The blood alcohol (C2H5OH) level can be determined by titrating a sample of blood plasma with an acidic potassium di-chromate solution, resulting in the production of Cr3+ (aq) and carbon dioxide. The reaction can be monitored because the dichromate ion (Cr2O72–) is orange in solution, and the Cr3+ ion is green. The balanced equations is
16H+(aq) + 2Cr2O72–(aq) + C2H5OH(aq) → 4Cr4+(aq) + 2CO2(g) + 11H2O(l)
This reaction is an oxidation–reduction reaction. What species is reduced, and what species is oxidized? How many electrons are transferred in the balanced equation above?
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Chapter 4 Solutions
Chemistry with Access Code, Hybrid Edition
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