Carboxylic acids can undergo reduction reactions. Reduction is the opposite of oxidation. For example, ethanoic acid (CH 3 COOH) can be formed by the oxidation of ethanol as shown below.

Using a measuring cylinder, measure 5 cm 3 of hydrochloric acid and add to a test-tube. Repeat step 1 with ethanoic acid into a separate test-tube. Add 5 drops of Universal Indicator to each test ...