Question

A student analyses a sample of honey by adding ammonium chloride and excess of
ammonium phosphate solution to it. A crystalline white precipitate is formed at the
sides of the test tube. The cation present is ………………….
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Answer 1

Answer:

The following table shows the test a student performed on four different aqueous solution which are X, Y, Z and W. Based on the observations provided, identify the action present.

Chemical test Observation Conclusion

To solution X, 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.

To solution Y ammonium hydroxide is added in minimum quantity first and then in excess. A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution.

To solution W a small quantity of sodium hydroxide solution hydroxide solution is added and then in excess. A white precipitate is formed which remains insoluble.

To a salt Z calcium hydroxide solution is added and then heated. A pungent smelling gas turning moist red litmus paper blue is obtained.