Answer to Question #131803 in Inorganic Chemistry for Inayatullah

Question

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

Answer 1

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⁺ + SO₃^2- + H₂O → 2Cu⁺ + SO₄^2- + 2H⁺

Cu⁺ + CNS^- → CuCNS(pres.)

Qualitative measure will be the formation of CuCNS precipitate.