Question

C
(a) State what is observed when - Ammonium hydroxide is
first added in a small quantity and then in excess to a
solution of copper sulphate..​

Answer 1

Explanation:

When NH

4

OH solution is added drop by drop to copper sulphate solution a pale blue / bluish white precipitate is formed which is soluble in excess of NH

4

OH and deep blue / inky blue solution is formed.

CuSO

4

+2NH

4

OH→Cu(OH)

2

+(NH

4

)

2

SO

4

Cu(OH)

2

+4NH

4

OH→Cu(NH

3

)

4

(OH)

2

+4H

2

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Answer 2

When sodium hydroxide solution is added drop by drop to zinc sulphate solution, initially a white precipitate of Zn(OH)2 is formed which is soluble when excess of sodium hydroxide is added due to formation of Na2ZnO2

The reactions are as follows:

ZnSO4 + 2NaOH → Zn(OH)2 + Na2SO4

Zn(OH)2 + 2NaOH → Na2ZnO2 + 2H2O.