Question Constellation Sign up for free AQA · GCSE · Chemistry · Higher
Desalination methods for potable water
Potable water can be produced from sea water by distillation.
Describe one other method to produce potable water from sea water.
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Marking points
- 1 Names reverse osmosis.
- 2 States that it uses membranes.
Full-mark answer
Use reverse osmosis, in which sea water is passed through membranes.
Why this answer loses marks
Desalinate the sea water.
The official guidance ignores this generic label; name reverse osmosis and state that it uses membranes.