C4 - Purifying and Testing Water

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What are the three main stages in water purification?
Sedimentation, filtration and chlorination
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What happens in sedimentation?
Chemicals are added to make solid particles and bacteria settle out.
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What happens in filtration?
A layer of sand on gravel filters out the remaining fine particles; some types of sand filter also remove microbes
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What happens in chlorination?
Chlorine is added to kill microbes
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How does the purification of water increase global warming?
Because it takes energy to pump and purify
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How can dissolved substances in water be removed?
By distillation
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What is the problem with distillation?
Takes huge amounts of energy, so it very expensive and it is only used when there is no fresh water
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How can water be tested?
With precipitation reactions using aqueous silver nitrate and barium chloride solutions
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What is a precipitation reaction?
Two solutions react to form a chemical that does not dissolve.
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Other cards in this set

Card 2

Front

What happens in sedimentation?

Back

Chemicals are added to make solid particles and bacteria settle out.

Card 3

Front

What happens in filtration?

Back

Preview of the front of card 3

Card 4

Front

What happens in chlorination?

Back

Preview of the front of card 4

Card 5

Front

How does the purification of water increase global warming?

Back

Preview of the front of card 5
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