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प्रश्न
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 an ammonia solution to give the azure blue solution. Explain with the equation.
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उत्तर
When ammonia (NH3) is added to water, it forms ammonium hydroxide (NH4OH).
\[\ce{NH3 + H2O <=> NH4OH}\]
Copper (II) sulphate (CuSO4) reacts with ammonium hydroxide to form a pale blue precipitate of copper (II) hydroxide (Cu(OH)2).
\[\ce{CuSO4 + 2NH4OH -> \underset{(Pale Blue ppt.)}{(NH4)2SO4} + Cu(OH)2↓}\]
The precipitate is a pale blue colour.
The pale blue precipitate of Cu(OH)2 dissolves in excess ammonium hydroxide to form a deep blue (azure) solution of tetraammine copper (II) sulphate.
\[\ce{Cu(OH)2 + 4NH4OH -> [Cu(NH3)4]SO4 + 4H2O}\]
The product is a deep blue complex ion. [Cu(NH3)4]2+ known as tetraammine copper (II).
The deep blue coloration confirms the formation of this complex.
संबंधित प्रश्न
Give a balanced chemical equation for Reaction of Ammonia with Nitric acid
State one relevant observation for the following
When ammonia gas is burnt in an atmosphere of excess oxygen.
Identify the substance underlined:
The catalyst used to oxide ammonia.
Name the gas evolved in each of the following cases :
Alumina undergoes electrolytic reduction.
Name the gas evolved in each of the following cases :
Ammonia reacts with heated copper oxide.
Name the following
Liquid when added to metallic nitride that yield ammonia.
State one possible source of each reactant used in the process.
Give balanced reactions for the following conversion:
Ammonia to ammonium carbonate.
The catalyst used in the oxidation of ammonia is ______.
The metallic hydroxide which forms a deep inky blue solution with excess ammonium hydroxide solution is ______.
