This definitions covers Key Definitions within Making Salts for GCSE Chemistry. Revise Making Salts in Chemical Changes for GCSE Chemistry with 20 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 8 of 13 in this topic. Make sure you can use the exact wording confidently, because definition marks are often lost through vague language.
Topic position
Section 8 of 13
Practice
20 questions
Recall
20 flashcards
📖 Key Definitions
Crystallisation: The process of allowing a dissolved solid to form crystals as a solution cools or as water evaporates. Used to obtain a pure, dry solid salt from solution.
Filtration: Separating an insoluble solid from a liquid by passing the mixture through filter paper. The solid stays on the paper (residue); the liquid passes through (filtrate).
Evaporation: Heating a solution to drive off water as water vapour, concentrating the solution so that the dissolved solid (salt) crystallises on cooling.
Precipitation: The formation of an insoluble solid when two solutions are mixed. The insoluble solid is called a precipitate and is denoted by (s) in equations.
Excess: Adding more of one reactant than is needed to ensure the other reactant is completely used up. Excess insoluble reactant is removed by filtration.