Ionic strength dependence of formation constants-V Protonation constants of some nitrogen-containing ligands at
P G Daniele1, C Rigano, S Sammartano
1Istituto di Analisi Chimica Strumentale dell'Università, via Bidone 36, 10125 Torino, Italy.
Abstract:
The protonation constants of 2,2'-bipyridyl, 1,10-phenanthroline, 1,3-diaminopropane, l-histidine and histamine have been determined potentiometrically, in the temperature range 10-40 degrees and at ionic strengths ranging from 0.04 to 1 (potassium chloride). The dependence of the protonation constants on ionic strength is described by a simple general equation. The enthalpy changes for the protonation of the ligands have been calculated from the temperature dependence of the protonation constants.
Related Concept Videos
Formation of Complex Ions
Ionic Strength: Overview
EDTA: Conditional Formation Constant
For the equilibrium reaction of the metal with the Y4− form of EDTA, the formation...
Complexation Equilibria: Overview
The equilibrium constant of the complexation reaction is represented as the formation constant...
Ladder Diagrams: Complexation Equilibria
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
Acid/Base Strengths and Dissociation Constants


