DifferenceModerate1 mark
6(i)
Distinguish between the following as directed:
Lead salt solution and zinc salt solution. [using NH₄OH solution in excess]
Topic: Qualitative analysis using NaOH and NH₄OH
Previous-year question practice database
Answer
Exam answer
With NH₄OH, Pb²⁺ gives a white precipitate insoluble in excess; Zn²⁺ gives a white precipitate soluble in excess.
Comparison
| Lead salt | Zinc salt |
|---|---|
| White Pb(OH)₂ precipitate insoluble in excess NH₄OH. | White Zn(OH)₂ precipitate dissolves in excess NH₄OH. |
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