Answer to Question #131807 in Inorganic Chemistry for Umair Ahmed Memon

Question #131807
If you are given a metallic sample containing copper than;
How do you estimate the Cu gravimetrically?
What are qualitative measures used to find Cu in a given sample?
1
Expert's answer
2020-09-05T14:40:54-0400

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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