Water treatment

Question 1

meaning of potable

Answer 1

water fit to drink

Question 2

name 3 places we get water from

Answer 2

surface water-lakes,reservoirs,rivers.(start to run dry in summer)

groundwater-aquifiers(rocks trap water underground)

waste water-water contaminated by a human process

Question 3

water is purified in _____ _________ ___________

Answer 3

water treatment plants

Question 4

name 3 steps in water purification

Answer 4

1. filtration-remove twigs,gravel,sand etc solids
2. Sedimentation-iron sulfate or aluminium sulfate added to water makes fine particles clump together and settle at bottom
3. Chlorination-chlorine gas bubbled thro kill harmful bacteria and microorganisms

Question 5

Name something that be can t removed by purification

Answer 5

soluble impurities -minerals

Question 6

Name another method used to make potable water and why it isnt used here

Answer 6

distilling sea water

expensive bc it uses loads of energy

Question 7

State why water used in chemical analysis must be pure and what shud be used instead

Answer 7

because ions from tap water can interfere with reactions and give the experiment a false result

use deionised water -water had ions present in normal tap water (calcium,iron etc)
removed .