State your observations when ammonium hydroxide solution is added drop by drop and then in excess to each of the following solutions :
(i) copper sulphate solution.
(ii) zinc sulphate solution.

(i) A bluish white precipitate appears which dissolves in excess of $N{H}_{4}OH$ and give an inky blue solution of tetra-amino copper sulphate.
(ii) A gelatinous white precipitate appears which dissolves in excess of $N{H}_{4}OH$ and give a clear transparent colourless solution of tetraamine zinc sulphate.