The amperometric titration of copper(II) sulfate with potassium permanganate in surfactant suspensions

✍ Scribed by Thomas C. Franklin; Remi A. Nnodimele

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 394 KB
• Volume: 6
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.1140061131

✦ Synopsis

Abstract

It has been demonstrated that it is possible, in the presence of a cationic surfactant, to oxidize copper(II) sulfate (CuSO~4~. 5H~2~O) with potassium permanganate in aqueous sodium hydroxide solutions and to oxidize the solid copper(II) sulfate with solid potassium permanganate in methylene chloride. Presumably the surfacant solubilizes the solids and protects the unusual valence from reaction with water. In both solvents, the rate of reaction was fast enough to be followed with an amperometric titration. The stoichiometric reactions in these solvents were found to involve one potassium permanganate for three copper(II) sulfates, indicating that copper(II) was oxidized to in copper(III) while permanganate was reduced to manganese(IV). The results show that both ions and solids, suspended and coated with surfactants, can react rapidly enough for the reactions to be used in titrations and that copper(III) can be formed by chemical reaction and stabilized by a cationic surfactant film.