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
25 Likes
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
Answered By
14 Likes
Related Questions
Give reasons for the following —
(a) Liquid ammonia is used as a refrigerant in ice plants.
(b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes.
(c) Aqueous solution of ammonia gives a pungent smell.
(d) Aqueous solution of ammonia conducts electricity.
Copy and complete the following equations.
(a) AlN + H2O ⟶
(b) 2NH3 + 3PbO ⟶
(c) NH3 + 3Cl2 ⟶
(d) NH3 + CO2 ⟶
(i) Which property of ammonia is illustrated by equation (c)?
(ii) What important fertiliser is prepared from equation (d)? State the conditions.
A gas 'P' gives dense white fumes with chlorine. It's aqueous solution gives a blue colour with copper (II) hydroxide. Give the name and formula of the gas P.
Give chemical equation(s) to prove that NH3 contains nitrogen and hydrogen?