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Describe the action of aqueous ammonia on solution of metallic salts.

Describe the action of aqueous ammonia on solution of metallic salts.

Answers

Kavungya
(i). Procedure:
- To about 2cm3 of solutions containing ions of calcium, magnesium, aluminium, zinc, iron, lead, copper etc in separate test tubes; aqueous ammonia is added dropwise till in excess.

(ii). Observations:
The various metal ions reacted as summarized in the table below.

table2532019126.png

(iii). Explanations:
- Most metal ions in solution react with ammonia solution to form insoluble metal hydroxides.
- In excess ammonia, some of the so formed hydroxides dissolve forming complex ions.

(iv). Equations:

fig2532019129.png

Note:
Zn2+(aq) and Cu2+(aq) dissolve in excess ammonia solution forming complex ions.
Kavungya answered the question on March 5, 2019 at 10:33

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