Question

which gas is evolve when drops of aqueous ammonia is added to aluminium salt and warm

Answer 1

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The pale blue precipitate of copper hydroxide dissolves in excess of ammonium hydroxide forming tetraamine copper[II] sulphate, an azure blue(deep blue) soluble complex salt. When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved.

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Answer 2

Ammonia gas is evolved when drops of aqueous ammonia are added to aluminium salt and warmed.

- When we add aqueous ammonia to an aluminium salt like aluminium sulphate, then the following reaction takes place:

Al2(SO4)3 + 6 NH3 + 6 H2O → 2 Al(OH)3 + 3 (NH4)2SO4

- When this mixture is heated, then ammonium sulphate decomposes into sulphuric acid and ammonia gas is evolved.

(NH4)2SO4 + Heat → 2 NH3 + H2SO4