Conditional Equilibrium Constants Reviewed
Por:
RODRIGUEZ DE SAN MIGUEL, EDUARDO, Gonzalez-Albarran, Rene, Rojas-Challa, Yahse
Publicada:
1 ene 2023
Ahead of Print:
1 sep 2021
Categoría:
Analytical chemistry
Resumen:
A free energy-based conceptual theoretical framework from which the
conditional equilibrium constant can be comprehensibly understood is
presented. This constant is found to be a weighted geometric mean of the
equilibrium constants of the reactions of all forms of the conditioned
species under buffering conditions, where the weight is given by a
function of their predominance in terms of their mole fractions. Once it
is shown that this type of equilibrium constant can be easily deduced
form free energy functions, it is shown how corrections for activity
coefficient can be incorporated as well. The framework additionally
permits to interpret side-reactions coefficients as free energy terms
related to the chemical speciation of the system, allowing the use of
the generalization of Hess' law to obtain conditional constants and a
straightforward deduction of multiconditional equilibrium constants.
Furthermore, different uses of the conditional constants along the
actual literature are reviewed as well allowing to have a complete and
updated panorama of the employment of this important concept in chemical
and speciation analysis in many areas of research.
Filiaciones:
RODRIGUEZ DE SAN MIGUEL, EDUARDO:
Ciudad Univ, Fac Quim, Dept Quim Analit, UNAM, Mexico City 04510, DF, Mexico
Gonzalez-Albarran, Rene:
Ciudad Univ, Fac Quim, Dept Quim Analit, UNAM, Mexico City 04510, DF, Mexico
Rojas-Challa, Yahse:
Ciudad Univ, Fac Quim, Dept Quim Analit, UNAM, Mexico City 04510, DF, Mexico
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