The blood alcohol (C_2H_5OH) level can be determined by titrating a sample of bl

Question

The blood alcohol (C_2H_5OH) level can be determined by titrating a sample of blood plasma with an acidic potassium dichromate solution, resulting in the production of Cr^3+ (aq) and carbon dioxide. The reaction can be monitored because the dichromate ion (Cr_2 O_7^2-) is orange in solution, and the Cr^3+ ion is green. The balanced equation is 16H^+ (aq) + 2Cr_2 O_7^2- (aq) + C_2H_5OH(aq) rightarrow 4Cr^3+ (aq) + 2CO_2(aq) + 11 H_2O(l) This reaction is an oxidation-reduction reaction. How many electrons are transferred in the balanced equation above?

Explanation / Answer

oxidation state of Cr changes from +6 to +3

In balanced equation there are 2 Cr

so,

number of electron transferred 2*(6-3) = 6

Answer: 6 electrons

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