C14.2 - Water safe to drink

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Chemistry

GCSE Chemistry

AQA

The Rate and Extent of Chemical Change

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Potable water

Drinkable water

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Places you can get fresh water

lakes, rivers, dams, groundwater

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Where fresh water is stored

Dams + reservoirs

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Stages of cleaning freshwater

  1. Filters remove large objects

  2. Chemicals added meaning large particles clump together and sink to the bottom

  3. Sand filter captures remaining particles

  4. Chlorine kills bacteria

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Ways water can be purified

Distillation
Reverse osmosis

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Distillation

Boiling salt and water to collect just the water and leave behind the salt

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Reverse osmosis

Pushes water through semi permeable membrane using a pump

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Problems with reverse osmosis and distillation

they use a lot of energy