of
-Alanine in the Propan-2-ol
Water Binary Solvent
E. N. Tsurko, N. V. Bondarev, T. M. Shikhova, and E. N. Popenko
Chemistry Department, Kharkov National University, pl. Svobody 4, Kharkov, 61077 Ukraine
E-mail: jelena.n.tsurko@univer.kharkov.ua
Abstract—To examine the effects of the medium on processes in solutions, the thermodynamic constants of
dissociation of 
-alanine through the abstraction of the carboxy and amino groups in propan-2-ol–water mix-
tures (with alcohol contents of 0, 20, 40, 60, 80% wt) were determined by measuring the emf of galvanic cells
without liquid junction over a temperature range from 278.15 to 328.15 K at 10 K intervals. The standard ther-
modynamic functions of dissociation of -alanine through the carboxy and amino groups were calculated. The
contributions of the short- and long-range interactions to the Gibbs
energy ofdissociation at carboxy (
d
)
and amino (d
) groups were analyzed. The standard Gibbs energy of transfer of the cationic (H2Z+) and
anionic (Z
) forms of -alanine from water into ethanol–water and propan-2-ol-water solvents at 298 K were
obtained. The t
(Z
) and Gibbs energy of transfer of inorganic anions were demonstrated to reflect a change in
basicity of the binary solvent at low values of the dielectric constant: MeOH
H2O 
PrOH-2
H2O < EtOH
H2O.
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