ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Nitrophenoxazines as Neutralization Indicators in Acetone and Pyridine Determination of Derivatives of Malonic Acid

Z. Stránský and J. Grúz

Department of Analytical Chemistry, Faculty of Natural Sciences, Palacký University, Olomouc

Abstract: Nitrophenoxazines were used as indicators for determinations of a number of weak acids in pyridine and acetone media. The obtained results were checked potentiometrically. Potentiometrie measurements in acetone showed that for substituted derivatives of malonic acid, arylhydrazonocyanacetylurethanes, the Hammett equation is valid in the range of potentials between the half-neutralization potentials and the values of σ constants. It has been also shown that considerable attention should be paid to the purity of the solvents used in the determinations of these substances.

Full paper in Portable Document Format: 266a507.pdf

Chemical Papers 26 (6) 507–515 (1972)