stability constant


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stability constant

[stə′bil·əd·ē ‚kän·stənt]
(chemistry)
Refers to the equilibrium reaction of a metal cation and a ligand to form a chelating mononuclear complex; the absolute-stability constant is expressed by the product of the concentration of products divided by the product of the concentrations of the reactants; the apparent-stability constant (also known as the conditional- or effective-stability constant) allows for the nonideality of the system because of the combination of the ligand with other complexing agents present in the solution.
References in periodicals archive ?
We illustrate the kind of behaviour of the stability constant [C.
0] is the distribution constant in the absence of HA/FA, [lambda] is the distribution constant in the presence of HA/FA, logK is stability constant of arsenate-HA/FA complex, x is number of moles of HA/FA that combine with 1 mole of arsenate, and [HA] is concentration of HA/FA in moles per L.
Thermodynamic quantities have been derived from overall stability constants: Stability constant and Themodynamic parameters for M(II)-Thymidine complexes in aqueous media at ionic strength 0.
Table 7 records the values of x (number of mol HA/FA that combine with 1 mol arsenic) as well as logK (where K is the stability constant of arsenic-HA/FA complexes).
Recently Buschmann has shown that the determination of the total concentration of a ligand in a salt solution by using UV-Vis spectroscopy allows the determination of the stability constant of the complex formed in solution.
2] where the authors investigated the stability constants of acrylic acid based cuprates complexes by adopting the method of Bjerrum [3].
In general, the stability constants of trivalent ions such as Al are higher than those of divalent ions such as Ca for complexes with carboxylate ligands, but their relative magnitude varies widely (Martell and Smith 1977; Tam and Williams 1984), so that in considering the effect of organic structure on the effectiveness of the organic additive (see Hue et al.
This chelating agent has a large stability constant with Fe 3+ metal ligand (logKML = 19.

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