title: New qualitative colour reaction for the identification of copper(I) compounds and complexes.
abstract: The colour reaction of copper(I) salts and complexes, in sulphuric acid medium, with ferricyanide and ammonia, has been used for the general identification of cuprous compounds. A sulphuric acid solution of Cu(I) compound, when treated with a dilute ferricyanide solution in the presence of ammonia, gives a salmon-pink, red-pink, pink-purple or purple colour or precipitate, characteristic of copper(I). Copper(II) compounds fail to give a positive response. The reaction also forms the basis of a test for ammonium ion and differentiation between ferrocyanide and ferricyanide. The preparation of the copper(I) complex of 1-allyl-2-tetrazoline-5-thione is described.
authors.affiliation: Department of Chemistry Vikramajit Singh Sanatan Dharma College Kanpur 208002 (U.P.), India.
authors.forename: G S
authors.initials: GS
authors.lastname: Johar
authors.forename: G
authors.initials: G
authors.lastname: Majumdar
authors.forename: R C
authors.initials: RC
authors.lastname: Dwivedi