On adding dilute ammonia solution to a colourless sulphate solution of sulphate salt, a white gelatinous ppt, appears. This ppt. however dissolves on addition of excess of ammonia solution. Identify (choose from ):
(i) Which metal salt solution was used?
(ii) What is the formula of the white gelatinous ppt. formed?
(iii) Why did the white ppt dissolve in excess of ?
(i) Zinc sulphate,
(ii) Zinc hydroxide,
(iii) The white precipitate dissolves in excess ammonium hydroxide because of the formation of soluble tetraamine zinc (II) sulphate, .