Specification Point 2.41C (Paper 2C Only):
Describe an experiment to prepare a pure, dry sample of an insoluble salt, starting from two soluble reactants

Preparation of Insoluble Salts

Using Two Soluble Reactants:

  • An insoluble salt can be made by a precipitation reaction by mixing two soluble salt solutions
  • A precipitation reaction is a reaction that produces a precipitate
Preparation of insoluble salt, CIE IGCSE Chemistry

The filtration of the mixture to remove the precipitate


  • Dissolve soluble salts in water and mix together using a stirring rod in a beaker
  • Filter to remove precipitate from mixture
  • Wash filtrate with water to remove traces of other solutions
  • Leave in an oven to dry

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Author: Jamie

Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.