The Stability of the Copper(II)-Eriochrome Red B Complex and the Compleximetric Titration of Copper(II) Ion

1 May 1970

journal article
research article
Published by Taylor & Francis in Analytical Letters

Vol. 3 (5) , 273-277
https://doi.org/10.1080/00032717008058556

Abstract

Values of the conditional stability constant of the copper(II)-Eriochrome Red B complex in aqueous solutions of pH 3–6 have been determined employing a cupric ion electrode. When the ionic strength of the solution is 0.01, the value of the second acidity constant (pk₂) of Eriochrome Red B is 6.28 and the logarithm of the stability constant of the copper complex, log k_CuHI, about 8.2. The complex can be used as an indicator in the ocapleximetric titration of cupric ion with EDTA at pH values from 4 to 8.

Keywords

This publication has 2 references indexed in Scilit:

Complex Formation Studies with Cupric Ion-Selective Membrane Electrodes
Analytical Letters, 1967
Chelatometrie. X
Analytical and Bioanalytical Chemistry, 1956