| Popis: |
Equations are deduced relating the viscosities of dilute solutions of formally uncharged species A, B, C … which do not interact physically with those of admixtures of these molecular species in the same solvent. The relative viscosity, ηrel. is shown to be a simple additive function for each component i involving its mole fraction X and the respective viscosity parameters (S0)iand (S1)i derived from the empirical equation ηrel. = 1 + (S0)X + (S1)X2. By introducing the condition that the species C is a chemical compound AnBm that dissociates to an extent α into the components A and B it is shown that precise viscosity measurements can be used as the basis of a novel procedure for determining the stability constants of such dissociable compounds. The method was tested for bis-adducts of the square planar complex (diacetylbisbenzoylhydrazone)nickel(II) with pyridine, 4-methylpyridine, and isoquinoline, and was found to give stability constants in good agreement with those obtained by other methods. Limitations and advantages of the new procedure are discussed critically. |
