THE SOLVOMOLALITY CONCEPT AS A STEP IN DEVELOPING THE IDEAS OF STRUCTURE-THERMODYNAMIC CHARACTERISTICS OF SOLUTIONS: DEDICATED TO THE ANNIVERSARIES OF THE BIRTH OF G.A. KRESTOV AND THE FOUNDATION OF THE INSTITUTE OF SOLUTION CHEMISTRY OF RAS BEING NAMED AFTER HIM

Being dedicated to the anniversary dates of the birth of Gennady Krestov, the corresponding member of Russian Academy of Sciences, and the foundation of the Institute of Solution Chemistry (ISC RAS) now named after him, this paper examines one of very important pages of the "Krestov's heritage" in terms of an innovative approach to studying the thermodynamic properties of solutions. We are talking here about the well-known solvomolality c(sm), concept as a rational form of expressing the solubility of gaseous substances in liquid media and the composition of non-aqueous and mixed solutions containing solvated non-electrolytes or ionic compounds. An important point in the development and comprehensive justification of the advantages of the c(sm), scale over other (traditional) ones was the fruitful cooperation of G.A. Krestov with one of his first and most talented followers Prof Vladimir Abrosimov. Their joint paper published 45 years ago in the interuniversity collection "Thermodynamics and Structure of Solutions" of the Ivanovo's ChemTech was marked the beginning of the use of the solvomolality concept for interpreting the results of many scientific studies in both the local "solution" school and other scientific communities. On the basis of the key requirements formulated by the authors of this work to choice of the method of expressing the solution concentration, it is shown that the c(sm), scale retains all advantages of both the mole-fraction scale and the molality one (in terms of applicability for calculating the thermodynamic characteristics of dissolution in the Lewis-Rendell system). It is also highlighted that owing to the deliberated scientific approach by V.K. Abrosimov, in collaboration with his followers and colleagues from ISC RAS and ISUCT, the solvomolality concept has found successful application in the interpreting the volume effects in solution, including those associated with the isotopic protium-deuterium substitution in the molecules of its components.