Chemistry
The questions below refers to the following salt solutions listed A to F:
A: Copper nitrate
B: Iron [II] sulphate
C: Iron [III] chloride
D: Lead nitrate
E: Magnesium sulphate
F: Zinc chloride
(i) Which soln. becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it.
(ii) Which solution gives a white precipitate with excess ammonium hydroxide solution.
Related Questions
Sodium hydroxide solution is added first in a small amount, then in excess to the aqueous salt solutions of:
- copper [II] sulphate
- zinc nitrate
- lead nitrate
- iron [III] sulphate
State in each case :
(i) the colour of the precipitate when NaOH is added in a small quantity;
(ii) the nature of the precipitate [i.e. soluble or insoluble] when NaOH is added in excess.
Write balanced equations for — (a) Aluminium (b) Zinc — is warmed with NaOH [caustic soda] soln.
From the list of substances given — Ammonium sulphate, Lead carbonate, Chlorine, Copper nitrate, Ferrous sulphate — State a solution of the compound which gives a dirty green precipitate with sodium hydroxide.
Write a balanced equation for the reaction between aluminium oxide and sodium hydroxide solution.