1. Solution 'A' gives black ppt, with dil. HCl and H2S gas, which basic radical is
present in given solution.
Doceribe identification nrocadura af R22+ or Ca2+ radical from given unknown
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The Basic radical present in the Solution is Ag+.
Here the solution used is AgNO3.
The identification procedure of Calcium cation is:
- Take a soluble salt of Calcium such as Ca(No3)2 and combine it with oxalic acid.
- on reacting we get a precipitate calcium oxalate (CaC2O4).
- this precipitate can easily react with acid such as H2SO4.
- on reaction with the acid, we get a white precipitate CaSO4.
- Hence, Ca2+ radical is identified.
Ca(NO3)2 + H2C2O4 = CaC2O4 + 2 HNO3
CaC2O4 + H2SO4 = CaSO4 + H2C2O4
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