A student wants to determine if a solid organic compound is a pure substance.
Which method should the student use?
Filter a solution of the sample to see if any residue remains.
Measure the melting point range of the sample.
Carry out a simple distillation.
Test its acidity with universal indicator paper.
46 exam-style questions on OCR GCSE Chemistry Purity and separating mixtures. Each one has a worked solution and a mark scheme showing where the marks go.