One type of alcohol breathalyzer used by law enforcement involves the following reaction.The amount of ethanol present is determined by a change in color of the solution.What type of reaction is this? 3 CH₃CH₂OH(g)+ 2 K₂Cr₂O₇(aq)+ 8 H₂SO₄(aq)$\to$ 3 CH₃COOH(aq)+ 2 Cr₂(SO₄)₃(aq)+ 2 K₂SO₄(aq)+ 11 H₂O( )

Question

Quizplus · Accepted Answer

The given reaction involves the oxidation of ethanol to acetic acid by the potassium dichromate(VI) in an acidic medium. The change in color of the solution is due to the reduction of the chromium(VI) ions to chromium(III) ions in the process. This is an example of an oxidation-reduction reaction.

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