Why physicochemical properties of aqueous solutions of various compounds are linearly interrelated

authors	Ferreira, LA; Loureiro, JA; Gomes, J; Uversky, VN; Madeira, PP; Zaslaysky, BY
nationality	International
journal	JOURNAL OF MOLECULAR LIQUIDS
author keywords	Water activity; Osmotic coefficient; Viscosity; Surface tension; Relative permittivity; Water-water interactions; Solvent dipolarity; HBD acidity
keywords	SOLVATOCHROMIC COMPARISON METHOD; ALIPHATIC AMINO-ACIDS; THERMODYNAMIC PROPERTIES; POLY(ETHYLENE GLYCOL); ACTIVITY-COEFFICIENTS; OPTICAL-ROTATION; WATER ACTIVITIES; SODIUM-CHLORIDE; BINARY-MIXTURES; SURFACE-TENSION
abstract	Analysis of physicochemical properties, such as water activity, osmotic coefficients, surface tension, viscosity, and relative permittivity, of aqueous solutions of different inorganic salts, organic compounds, and polymers shows that these properties are linearly interrelated. and this interrelationship may be described as: Y-1(i) (c(1)(i)) = k(1) + k(2)Y(2)(i)(c(2)(i)) + k(3)Y(3)(i)(c(3)(i)), where Y-1(i)(c(1)(i)), Y-2(i)(c(2)(i)), and Y-3(i)(c(3)(i)) are properties of aqueous solutions of individual compounds 1, 2, and 3 at the same ith concentration i of each compound (c(1)(i) = c(2)(i) = c(3)(i)); k(1), k(2), and k(3) are constants. The relationship holds for various concentrations of compounds provided properties of aqueous solutions of the individual compounds are compared at the same concentration of each compound. Similar interrelationships are established also between different properties of aqueous solutions of any given compound. It is suggested that the reason for these relationships is that all physicochemical properties of aqueous solutions of any compound display different aspects and peculiarities of intermolecular water-water interactions affected by the presence of the compound, its nature, and concentration. The different types of water-water interactions in aqueous solutions may be quantified with the solvatochromic dyes. The solvent dipolarity/polarizability, pi, hydrogen bond donor acidity, alpha, and hydrogen bond acceptor basicity, beta of water reported previously for aqueous solutions of organic compounds and polymers as well as those obtained for solutions of inorganic salts are linearly interrelated likely due to the cooperativity of intermolecular interactions in water. It is shown that any physicochemical property of aqueous solution of a given salt, organic compound, or polymer may be described by linear combination of two solvent features, pi and alpha, or in some cases by a single solvent feature. This fact explains the reason for the existence of the aforementioned linear interrelationships between the physicochemical properties of aqueous solutions of different compounds. 2016 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE BV
issn	0167-7322
year published	2016
volume	221
beginning page	116
ending page	123
digital object identifier (doi)	10.1016/j.molliq.2016.05.068
web of science category	Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category	Chemistry; Physics
unique article identifier	WOS:000383004100015