Question #131803

What are qualitative measures used to find Cu in given sample??

Expert's answer

Cu is precipitated quantitatively as copper (I) thiocyanate from slightly acid solution in the presence of sulfurous acid using a solution of ammonium thiocyanate as reagent.


2Cu2+ + SO32- + H2O → 2Cu+ + SO42- + 2H+


Cu+ + CNS- → CuCNS(pres.)


Qualitative measure will be the formation of CuCNS precipitate.




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