A cough medicine is a formulation. It contains an active drug, a sweetener, a colouring and water.
Give two reasons why the cough medicine is a formulation.
The cough medicine does not boil at one specific temperature.
Explain why.
Name the technique that could be used to show that the colouring in the medicine contains two dyes.
40 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.