!!!HKDSE syllabus only!!!
How to distinguish between Al3+ and Pb2+ ion?
Both hydroxide form white ppt
Both hydroxide redissolve in excess NaOH(aq)
Both hydroxide does not redisslove in excess NH3(aq).
Any way to distinglish between them?
distinglish Pb/Al ion HKDSE
2015-05-17 8:00 pm
回答 (1)
2015-05-17 8:27 pm
✔ 最佳答案
Method 1 :Add sodium sulphate solution (or dilutesulphuric acid) to the unknown solution.
Lead(II) ion forms a white precipitate of lead(II) sulphate.
Pb²⁺(aq) + SO4²⁻ (aq) →PbSO4(s)
Aluminium ion gives no reaction.
Method 2 :
Add sodium chloride solution (or dilute hydrochloric acid) to theunknown solution.
Lead(II) ion forms a white precipitate of lead(II) chloride.
Pb²⁺(aq) + 2Cl⁻ (aq) → PbCl2(s)
Aluminium ion gives no reaction.
收錄日期: 2021-04-15 20:13:54
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