The formation constants of H+, Li+, Na+, K+, NH+4 and Ca2+ hexacyanoferrate(II) complexes in aqueous solution have been obtained by pH-metric measurements at 10, 25 and 35°C and 0.05 ⩽ I ⩽ 1 mol 1−1. The species [ML], [M2L] and [MLH] have been found for all cations. The dependence of formation constants on ionic strength has been obtained by a simple Debye-Huckel type equation. From the dependence on temperature, estimates of ΔH0 and ΔS0 for the formation of all complexes have been calculated. Some linear relationships have been found for the formation constants. Comparisons with literature data are reported.
Studies on Hexacyanoferrate(II) Complexes. Formation Constants for Alkali Metal, Ammonium and Calcium(II) Complexes at Different Temperatures and Ionic Strengths in Aqueous Solution
DE ROBERTIS, Alessandro;SAMMARTANO, Silvio;
1986-01-01
Abstract
The formation constants of H+, Li+, Na+, K+, NH+4 and Ca2+ hexacyanoferrate(II) complexes in aqueous solution have been obtained by pH-metric measurements at 10, 25 and 35°C and 0.05 ⩽ I ⩽ 1 mol 1−1. The species [ML], [M2L] and [MLH] have been found for all cations. The dependence of formation constants on ionic strength has been obtained by a simple Debye-Huckel type equation. From the dependence on temperature, estimates of ΔH0 and ΔS0 for the formation of all complexes have been calculated. Some linear relationships have been found for the formation constants. Comparisons with literature data are reported.File in questo prodotto:
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