Desalination + Distillation

?
  • Created by: Maddie-P
  • Created on: 22-01-21 20:13
What does Potable mean?
Potable means 'safe for drinking'.
1 of 13
Where does the raw material for producing drinking water come from?
Rivers, Lakes and Aquifers (underground rocks containing groundwater).
2 of 13
Where is the water stored?
The water is stored in reservoirs which are artificial lakes.
3 of 13
What can fresh water from raw material sources contain?
The water can contain:
- Objects such as leaves and twigs
- Small insoluble particles such as grit and silt
- Soluble substances (including salts, pesticides and fertilisers)
- Bacteria and other microorganisms that may be harmful to health
4 of 13
What is the first step of making waste and ground water potable?
The first step is sedimentation. This is when small particles are allowed to settle out to the bottom of the body of water.
5 of 13
What is the second step of making waste and ground water potable?
The second step is Filtration. This uses tanks containing beds of sand and gravel to remove small particles.
6 of 13
What is the third step of making waste and ground water potable?
The third step is Chlorination. This is a process where chlorine is added to kill microorganisms in the treated water and to remove bacteria.
7 of 13
What is the process that produces pure water from sea water?
This process is called Desalination which uses simple distillation.
8 of 13
What are the steps of desalination?
The first step is where the sea water is heated so that water vapour leaves it quickly. This vapour is then cooled and condenses forming water without the dissolved salts.
9 of 13
What is a disadvantage to Desalination?
A disadvantage is that a lot of energy must be transferred to sea water during simple distillation.
10 of 13
When is desalination normally used?
It is mainly carried out on a large scale where energy resources are cheap or plentiful or where there is an abundant supply of sea water.
11 of 13
What is chemical analysis?
Chemical analysis is used to identify and measure the substances in a sample.
12 of 13
Why is distilled water used for chemical analysis?
Distilled water is used for chemical analysis so that it does not contaminate our sample giving us false results.
13 of 13

Other cards in this set

Card 2

Front

Where does the raw material for producing drinking water come from?

Back

Rivers, Lakes and Aquifers (underground rocks containing groundwater).

Card 3

Front

Where is the water stored?

Back

Preview of the front of card 3

Card 4

Front

What can fresh water from raw material sources contain?

Back

Preview of the front of card 4

Card 5

Front

What is the first step of making waste and ground water potable?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Testing and analysing substances resources »