Water Flashcards
1
Q
What is hard water
A
Hard water is water that does not easily form a lather with soap
2
Q
What is temporary hardness
A
Hardness caused by compounds that can be removed by boiling ie. hydrogen carbonates
3
Q
What is permanent hardness
A
hardness caused by compounds that cannot be removed by boiling
4
Q
What are the advantages of hard water
A
Gives water its taste
Provides calcium for teeth and bones
5
Q
What are the disadvantages of hard water
A
Produces scale in kettles and dishwaters etc.
Produces scum
Wastes soap
6
Q
What is the reaction when hard water is boiled
A
Ca(HCO3)2 –> CaCO3 + H2O + CO2
7
Q
What are the methods to remove hardness
A
Ion Exchange resin
Distillation
8
Q
What are the types of water pollution
A
Eutrophication
Deoxygenation
Chemical Pollution
Pollution by heavy metals
