Chemistry
Ammonia solution in water gives a blue precipitate when it combines with a solution of copper salt. The blue precipitate further dissolves in excess of ammonia solution to give an azure blue solution. Explain with equation.
Ammonia
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Answer
Ammonia solution in water gives a blue precipitate when it combines with a solution of copper salt, due to the formation of Cu(OH)2
CuSO4 + 2NH4OH ⟶ (NH4)2SO4 + Cu(OH)2 ↓
The pale blue precipitate of copper hydroxide dissolves in excess of ammonium hydroxide forming tetraamine copper [II] sulphate, an azure blue soluble complex salt.
Cu(OH)2 + (NH4)2SO4 + 2NH4OH ⟶ [Cu(NH3)4]SO4 + 4H2O
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Related Questions
State relevant observation for the following:
(a) Ammonia gas is passed over heated copper (II) oxide.
(b) In the absence of catalyst, ammonia is burnt in an atmosphere of oxygen.
(c) Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate.
(d) Water is added to the product formed, when Al is burnt in a jar of nitrogen gas.
(e) Excess of chlorine gas is reacted with ammonia gas.
(f) Calcium hydroxide is heated with ammonium chloride crystals.
(a) Is ammonia more dense or less dense than air?
(b) What property of ammonia is demonstrated by the Fountain Experiment?
(c) Write the balanced equation for the reaction between ammonia and sulphuric acid.
Give chemical equation(s) to prove that NH3 contains nitrogen and hydrogen?
When an ammonium salt is warmed with sodium hydroxide solution, a gas is evolved. State three ways in which you could identify this gas.