8. Study of Compounds — A. Hydrogen Chloride
Hydrogen chloride: preparation of hydrogen chloride from sodium chloride; refer to the density and solubility of hydrogen chloride (fountain experiment); reaction with ammonia; acidic properties of its solution.
- Preparation of hydrogen chloride from sodium chloride; the laboratory method of preparation can be learnt in terms of reactants, product, condition, equation, diagram or setting of the apparatus, procedure, observation, precaution, collection of the gas and identification.
- Simple experiment to show the density of the gas (Hydrogen Chloride) – heavier than air.
- Solubility of hydrogen chloride (fountain experiment); setting of the apparatus, procedure, observation, inference.
- Method of preparation of hydrochloric acid by dissolving the gas in water- the special arrangement and the mechanism by which the back suction is avoided should be learnt.
- Reaction with ammonia.
- Acidic properties of its solution - reaction with metals, their oxides, hydroxides and carbonates to give their chlorides; decomposition of carbonates, hydrogen carbonates, sulphides, sulphites.
- Aqua regia composition and uses.
- Precipitation reactions with silver nitrate solution and lead nitrate solution.
- Tests for HCl gas and Hydrochloric acid.