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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

(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.


(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.

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

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