A laboratory is testing a water-treatment process. A colourless aqueous sample is known to contain either one of the first four alcohols or one of the first four carboxylic acids. Acidic samples are treated with alkali before the next stage of the process.
Describe how universal indicator can be used to decide whether the sample needs to be treated with alkali.
97 exam-style questions on AQA GCSE Chemistry 7.2 Reactions of alkenes and alcohols, covering 7.2.1 Structure and formulae of alkenes, 7.2.2 Reactions of alkenes, 7.2.3 Alcohols, 7.2.4a Carboxylic acids, and 7.2.4b Carboxylic acids as weak acids. Each one has a worked solution and a mark scheme showing where the marks go.