Question

Aluminium fluoride is almost completely insoluble in cold water, but aluminium
chloride dissolves to give a clear solution. The addition of aqueous sodium hydroxide to
this solution produces a white precipitate which dissolves in an excess of aqueous
sodium hydroxide forming another clear solution.
(i) What enthalpy factors are involved in process of dissolving an ionic salt in water? Use
these factors to suggest a reason why AlF3, is so insoluble.
(ii) Suggest equations for the formation of the white precipitate and for its dissolving in
an excess of aqueous sodium hydroxide.

Answer 1

Answer:

aluminium chloride and fluoride, aluminium nitride and sulphide, as well as ... The water solubility of aluminium compounds is limited except for its salts, ... ore is dissolved in a solution of sodium hydroxide and the aluminium hydroxide ...

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