Constants of Ionization of L-Alanine at Different Ionic Strengths of a Solution and Concentrations of Amino Acid

被引：1

作者：

Eshova, G. B. ^{[1
]}

Davlatshoeva, Dzh. A. ^{[2
]}

Rakhimova, M. ^{[1
]}

Miraminzoda, F. ^{[1
]}

Toirzoda, M. A. ^{[3
]}

机构：

[1] Tajik Natl Univ, Res Inst, Dushanbe 734025, Tajikistan

[2] Tajik Natl Univ, Dushanbe 734025, Tajikistan

[3] Pedagog Inst, Dushanbe 734003, Tajikistan

来源：

RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2023年 / 97卷 / 10期

关键词：

potentiometry; alanine; concentration; constants of ionization; ionic strength; pH; zwitterions; BETA-ALANINE;

D O I：

10.1134/S0036024423100084

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Processes of alanine ionization are studied via potentiometry at a temperature of 298.15 K and different ionic strengths of a NaHClO4 solution. Constants of the acid's thermodynamic ionization are calculated at three concentrations of alanine. Different empirical and semi-empirical equations are used to calculate the coefficients of ionic activity in terms of the second and third approximations of the Debye-Huckel theory. Values of pK(a1) and pK(a2) are calculated at 298.15 K, solution ionic strengths of 0.1, 0.25, 0.5, 0.75, and 1.0 mol/L, and concentrations of 1.0 x 10(-3)-3.0 x 10(-3) mol/L with a confidence level of P = 0.95.

引用

页码：2144 / 2148

页数：5

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