C4H Purifying and Testing Water

What are the four main sources of water?

Name one thing that water is important for apart from drinking, washing and other jobs in the home?

What can untreated water contain?

What would happen in a typical water treatment process?

What is one advantage and one disadvantage with distillation?

Why don't we use sea water as drinking water?

What kind of pollutants can be found in water?

The dissolved ions of some salts are easy to identify as they will undergo precipitation reaction. A precipitation reaction occurs when an insoluble solid is made from mixing two solutions together. Sulphates can be detected using barium chloride solution. What colour is the precipitate?

Silver nitrate solution is used to detect halide ions. Halides are ions made by the halogens. With silver nitrate what colour precipitates do chlorides, bromides and iodides form?