#2.44
describe tests for these gases:
- hydrogen
- oxygen
- carbon dioxide
- ammonia
- chlorine.
#2.45
describe how to carry out a flame test
#2.46
know the colours formed in flame tests for these cations:
- Li+ is red
- Na+ is yellow
- K+ is lilac
- Ca2+ is orange-red
- Cu2+ is blue-green.
#2.47
describe tests for these cations:
- NH4+ using sodium hydroxide solution and identifying the gas evolved
- Cu2+, Fe2+ and Fe3+ using sodium hydroxide solution.
#2.48
describe tests for these anions:
- Cl–, Br– and I– using acidified silver nitrate solution
- SO42– using acidified barium chloride solution
- CO32– using hydrochloric acid and identifying the gas evolved.
#2.49
describe a test for the presence of water using anhydrous copper (II) sulfate
#2.50
describe a physical test to show whether a sample of water is pure