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Questions
Using sodium hydroxide solution, how will you distinguish: Zinc nitrate solution from calcium nitrate solution
How will you distinguish calcium nitrate and zinc nitrate solution?
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Solution 1
Zinc nitrate solution from calcium nitrate solution :
(i) \[\ce{Zn(NO3) + 2NaOH -> Zn(OH)2 + 2NaNO3}\]
On further addition of NaOH, Zn(OH)2 dissolves.
(ii ) \[\ce{Ca(NO3)2 + 2NaOH -> Ca(OH)2 + 2NaNO3}\]
Ca(OH)2 precipitates are sparingly soluble in excess of sodium hydroxide.
Solution 2
- Adding sodium hydroxide solution to zinc nitrate results in a white precipitate that is soluble in excess sodium hydroxide.
- Adding sodium hydroxide solution to calcium nitrate results in a white precipitate that is insoluble in excess of sodium hydroxide.
Notes
Students should refer to the answer according to their questions
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