Safe Water

Question 0

What’s the test for ammonia?

Answer 0

Damp red litmus paper

Question 1

How do you test for halide ions?

Answer 1

Add a few drops of dilute nitric acid to the sample, then a few drops of silver nitrate solution.

Question 2

Describe the tests you would use to identify ammonium chloride

Answer 2

Add sodium hydroxide and warm the mixture

Damp red litmus paper

Question 3

How do you test for water purity?

Answer 3

Chlorine is added to kill harmful microorganisms

Aluminium sulphate is added to remove small solid particles

Question 4

Why are analytical chemists employed in hospitals?

Answer 4

To test blood
To test urine
To help doctors identify illnesses

Question 5

Describe a laboratory test to see if a sample of water contains sulphate ions

Answer 5

Add a small volume of the water to a test tube. Add a few drops of hydrochloric acid the a few drops of barium chloride solution.

If a white precipitate forms, the water contains sulphate ions.