A student wants both pure solvent and dissolved solid from a solution. Which plan is best?
Evaporate the solution until only dry solid remains
Filter the solution, then evaporate the filtrate
Crystallise the solution, then filter off the crystals
Distil to collect the solvent, then crystallise the residue
107 exam-style questions on Edexcel GCSE Chemistry 3.2 Methods of separating and purifying substances, covering 3.2.1 Pure substances and mixtures, 3.2.2 Techniques for separating mixtures, 3.2.3 Paper chromatography and Rf values, and 3.2.4 Making water potable. Each one has a worked solution and a mark scheme showing where the marks go.