Identify the substance underlined cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide.
Important Questions on Analytical Chemistry: Uses of Sodium and Ammonium Hydroxides
Identity the salts and from the observations given below:
On performing the flame test salt produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate solution, which is soluble in ammonium hydroxide solution.
Identity the salts and from the observations given below:
When dilute is added to a salt , a brisk effervescence is produced and the gas turns lime water milky. When solution is added to the above mixture (after adding dilute ), it produces a white precipitate which is soluble in excess solution.
State your observations when ammonium hydroxide solution is added drop by drop and then in excess to copper sulphate solution.
State your observations when ammonium hydroxide solution is added drop by drop and then in excess to zinc sulphate solution.
| Chemical test | Observation | Conclusion |
|---|---|---|
| To solution , ammonium hydroxide is added in minimum quantity first and then in excess. | A dirty white precipitate is formed which dissolves in excess to form a clear solution | (i) |
| To solution , ammonium hydroxide is added is minimum quantity first and then in excess | A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution. | (ii) |
| To solution , a small quantity of sodium hydroxide solution is added and then in excess. | A white precipitate is formed which remains insoluble. | (iii) |
| To a salt , calcium hydroxide solution is added and then heated. | A pungent smelling gas turning moist red litmus paper blue is obtained. | (iv) |
