CC2E Drinking water

Question 1

What does potable mean

Answer 1

Safe to drink

Question 2

How can waste and groundwater be made potable

Answer 2

Sedimentation: Large insoluble particles sink to the bottom after the water is left still for a while
Flitration: Removes small insoluble particles by passing the water through layers of sand and filters
Chlorination: Kills bacteria and microorganisms which are too small to be removed by filtration

Question 3

How can seawater be made potable

Answer 3

Distillation
Filter to remove insoluble particles
Boil
Cool and condense the water vapour

Question 4

What issues surround the process of making seawater potable

Answer 4

Extremely expensive as it requires a lot of energy to boil large volumes of water
Wastewater is toxic due to the high concentration of salt so must be disposed of carefully

Question 5

What is deionised water

Answer 5

Water that has had metallic ions (such as copper or calcium ions) removed

Question 6

Why is deionised water used in experimental analysis

Answer 6

Deionised water is used to prevent ions in the water interacting with the substsances under analysis. If water wasn’t deionised, false positive results may be produced