Heteromolecular constant

Subtype Illd is represented by e isotherms with a maximum. Typically, this kind of isotherm corresponds to systems with high heteromolecular association constant. Component interaction results in associates with greater values of DM than expected from individual components. Carboxylic acids-amines have this type of isotherms. 

Finally, subtype Ille includes rare kind of e isotherms with a singular maximum, which indicates equilibrium constant with high heteromolecular association. This kind of isotherm is represented by system SnCl4-ethyl acetate. 

The isotherms InK vs. 1/e (298.15K) are presented in Figure 9.8. These dependencies (right lines 1,2,4,5) are required for calculation of equilibrium constants of the heteromolecular association process free from specific solvation effect. It can be seen from Figure 9.8 that the values InK, regardless of solvent nature, lie on the same line 3, which describes the change of equilibrium constants of the process [9.84] in the universal solution CCl4-heptylchloride. 

Heteromolecular association process of o-nitrophenol and triethylamine can be an example of the management of products output. Association constant of this process has been determined for some solvents. Use of hexane instead of 1,2-dichloroethane, DHLE, increases products output from 6% to 93%. 

General analysis of the binary solvent mixtures formed by two solvate active components (these solvents are often used in analytical and electrochemistry) was conducted to evaluate their effect on H-acids. The analysis was based on an equation which relates the constant of ion association, K, of the solvent mixture and constants of ion association of the acid Kj and K of each component of the mixed solvent, using equilibrium constants of scheme [9.105] - heteromolecular association constant, ionization constant of the... 

Low eonstant of the ion associate formation process of triphenylehloromethane, high constant of the ion assoeiation proeess, and low constant of the heteromolecular association process of HCI (HCI solutions in listed solvents obey the Henry s Law) show that only methanol is an associative partieipant of the equilibrium. 

The degree of heteromolecular association of esters in reaction [9.121 ] is higher than for acids when K< j values are equal. Thus the change of equilibrium constant according to [9.121] depends on electrostatic component. for fliese reactions also depends on exponentially reciprocal e. 

In universal media formed by two solvate-inert solvents according to equation [9.53a], equihbriiun constants of the process of heteromolecular adduct formation depend exponentially on reciprocal permittivity thus... 

Let us consider the effect of specific solvation on equihbrium constant of the heteromolecular association process as an example of associate formation with a simplest stoichiometry ... 

Thus for Kef calculation one must obtain the equilibrium constant of processes [9.71] - K s, [9.69] - Kea and [9.70] - Kpg from conductance measurements. The constant Kef is identified in literature as calculated by taking into account the specific solvation . The value Kef characterizes only the universal solvation effect on the process of heteromolecular associate formation. The approach cited above can be illustrated by equilibrium ... 

K344 the constant of the process formation of heteromolecular adduct... 

In this section, we discuss physical characteristic change due to the changes of binary mixed solvent composition in the systems with chemical interactions between components (these systems are the most cotmnonly used in science and technology). Comprehensive discussion of the physical and chemical analysis of such systems, including stoichiometry and stability constants, determination of the formation of heteromolecular associates can be found in a specialized monograph. ... 

Subtype Ilia is represented by isotherms lying between the curve obtained from eq. [8.1.26] and the additive line. This isotherm subtype occurs in systems with low value of heteromolecular association constant. The system n-butyric acid-water can be mentioned as a typical example of the subtype. 

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