Question

1. Potassium permanganate is another strong oxidizing substance similar to potassium dichromate. An acidic solution of purple permanganate ions can get reduced to colorless Mn2+ ions in the presence of ethanol. Write down the redox reaction between permanganate and ethanol, and balance it using the half-reaction method. 2. Besides vodka, there are other colorless alcohol-containing beverages that can be titrated following the procedure in your lab. Given the average values for the percent alcohol by volume listed in the table below, which beverage do you expect to use the least amount of iron (II) standard solution during the titration? Assume all lab procedures stay the same.

Answer 1

for the part b) I need the values of the tables, for the first questions here's the reaction:

MnO₄^- + C₂H₅OH -----------> CH₃COOH + Mn²⁺

The half reaction method in acidic medium is:

(8H⁺ + MnO₄^- + 5e^----------> Mn²⁺ + 4H₂O)*2
(C₂H₅OH + H₂O -------> CH₃COOH + 2e^- + 2H⁺) * 5

16H⁺ + 2MnO₄^- + 10e^----------> 2Mn²⁺ + 8H₂O
5C₂H₅OH + 5H₂O -------> 5CH₃COOH + 10e^- + 10H⁺

Final reaction:
6H⁺ + 2MnO₄^- + 5C₂H₅OH -----------> 5CH₃COOH + 2Mn²⁺ + 3H₂O

Hope this helps