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This lesson covers how to prepare soluble salts from acids and insoluble bases (or insoluble carbonates), as required by the Edexcel GCSE Combined Science specification (1SC0). You need to understand the practical method, why an excess of the insoluble substance is used, and the key steps of filtration, evaporation and crystallisation.
Salts are essential chemical compounds with a wide range of uses:
In the laboratory, you can make a pure, dry sample of a soluble salt by reacting an acid with an insoluble base or an insoluble carbonate.
To make a particular salt, you need to choose the correct acid and base:
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