Water and purification
- Created by: Freya Woolley
- Created on: 08-12-15 19:35
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- Water and purification
- Natural waters contain dissolved salts
- Tests for water:
- Boils at 100c
- Cobalt chloride:
- Dip paper in water- blue-->pink
- Hydrated copper sulphate:
- Blue copper sulphate turns white when water is removed
- Reversible reaction- when water added turns back blue
- Blue copper sulphate turns white when water is removed
- Purification
- Slow sand filters:
- biofilm contains bacteria, fungi and protozoa
- Good bacteria destroys and kills the bad
- Dirt and bacteria get trapped in sand
- Good bacteria destroys and kills the bad
- biofilm contains bacteria, fungi and protozoa
- Ion resins:
- Water goes through filter cartridge- activated carbon, an ion exchange resin and silver
- Ion exchange resin removes calcium, magnesium, lead, copper and aluminium ions
- Water goes through filter cartridge- activated carbon, an ion exchange resin and silver
- Distillation:
- separates pure liquids from mixtures- liquids have different boiling points.
- Desalination:
- removing dissolved salts- fresh water from seawater
- Slow sand filters:
- Fluoridation:
- Fluorine is added to water to help reduce tooth decay
- Against: unnecessary, tooth staining, unethical
- Fluorine is added to water to help reduce tooth decay
- Chlorine is added to sterilise- remove microbes
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