Extraction of Chromium(III) and Manganese(II) with N, NI-ethylenebis(salicylimine)(H2EBSI) in Acid Medium: Determination of Stability Constant and Thermodynamic Parameters of the Extracted Species
F. S. Nworie *
Department of Industrial Chemistry, Ebonyi State University, P.M.B. 053 Abakaliki, Ebonyi State, Nigeria.
F. I. Nwabue
Department of Industrial Chemistry, Ebonyi State University, P.M.B. 053 Abakaliki, Ebonyi State, Nigeria.
J. John
Department of Industrial Chemistry, Ebonyi State University, P.M.B. 053 Abakaliki, Ebonyi State, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
In this study, the solvent extraction of chromium(III) and manganese(II) with N, N1- ethylenebis(salicylimine) were carried out from different concentrations of various mineral acids (HCl, HNO3, H2SO4, and HClO4). In the range of analytical concentrations of the acids studied (0.0001-2M), it was discovered that the distribution ratio was highest in 0.0001M HCl and lowest in HClO4 for chromium (III) and manganese (II). The stability constant of the extracted species suggest that chromium (III) specie is more stable than manganese(II) specie (Logβ Cr(III) = 5.98 and Logβ Mn(II) = 5.88). Also, the extraction system suggests a chelating mechanism where mononuclear ion pair chromium(III) H2EBSI complex and dinuclear ion pair manganese(II) H2EBSI complex are formed.
Keywords: Chromium(III), manganese(II), stability constant, N, N1-ethylenebis(salicylimine), liquid-liquid extraction