Question

Identify the cations:
1. Cation that does not form precipitate with ammonium hydroxide but forms one with NaOH solution.
2. NaOH solution when added to solution P gives a reddish-brown precipate.
3. Ammonium hydroxide solution when added to the solution Q gives white precipitate which does not dissolve in excess.
4. NaOH solution when added to solution R gives white precipitate which is insoluble in excess.

Answer 1

1 Ka answer

Sodium hydroxide solution when reacts with Ca2+ ion, it forms a white precipitate of calcium hydroxide. Ammonium hydroxide don't effectively react with Ca2+ ions due to low concentration of hydroxyl ions.

2 Ka answer

When excess sodium hydroxide is added to calcium nitrate solution. Study later

3 Ka answer

Ammonium Hydroxide –When Ammonium hydroxide solution is added to copper sulphate solution, pale blue precipitate of Cu(OH)2 is formed which further does not dissolve in excess ammonium hydroxide.

4 Ka answer

Calcium white. White precipitate. Insoluble in excess ... NaOH solution when added to the solution 'A' gives ... The pale green solid R turns reddish brown on heating.

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