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GCSE Combined Science · key term
The removal of dissolved salts from salty water or sea water.
Used by AQA and Edexcel
Specification 5.10.1.2 · Paper 4
Revise: Potable Water ProductionWhere fresh-water supplies are limited, salty water or sea water may be used. Its dissolved salt content is too high for drinking, so desalination is needed. Ordinary filter beds cannot remove these dissolved salts.
Specification Methods of separating and purifying substances · Paper 1, Paper 2, Paper 3, Paper 4
The removal of dissolved salts from seawater or other salty water.
Revise: The water cycle and potable waterDesalination removes dissolved salts from seawater or other salty water. One method is distillation. Seawater is heated until water boils and becomes vapour.
The removal of dissolved salts from sea water.
Give the purpose of each treatment: filter beds remove insoluble particles; sterilisation kills microbes; desalination removes dissolved salts.
Explain desalination by stating what happens to both the water and the dissolved salts.
When evaluating desalination, link its reliable water supply to its energy costs and the need to dispose of concentrated brine safely.
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