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GCSE Chemistry · key term
A desalination process in which pressure forces water through a partially permeable membrane while dissolved salts are retained.
Used by AQA and OCR
Specification 4.10.1.2 · Paper 2
Revise: Water Treatment and PotabilityIn reverse osmosis, high pressure forces water through a partially permeable membrane. Water molecules pass through, while dissolved salts are retained to a large extent.
Specification C6.3g · Paper 2 (Foundation), Paper 4 (Higher)
A method of separating water from dissolved salts by forcing it through a membrane that lets water pass but holds back the salts.
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In reverse osmosis, pressure forces water through a membrane that lets water molecules through but holds back dissolved salts. The resulting water must still be made safe for drinking where necessary.