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Describe the Qualitative analysis for cations using sodium hydroxide solution.

Describe the Qualitative analysis for cations using sodium hydroxide solution.

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 sodium hydroxide is added dropwise till in excess.

(ii). Observations:
The various metal ions reacted as summarized in the table below.
fig53042019103.png

(iii). Explanations:
- Most metal ions in solution react with sodium hydroxide solution to form insoluble metal hydroxides.
- In excess sodium hydroxide, some of the so formed hydroxides (hydroxides of Zn, Al, Pb and Cu) dissolve forming complex ions.

fig53042019110.png
Kavungya answered the question on April 30, 2019 at 10:11

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