Heat of dilution
apparent molal volume
Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Abstract The densities, heat capacities, heats of dilution, and viscosities of aqueous 1,1′-dimethyl-4,4′-dipyridinium dichloride were measured below 1 m at 25°C. From the standard partial molal volumes and heat capacities and the Bη viscosity coefficients, this salt is shown to be a strong structure breaker. The excess enthalpies, entropies, volumes, and heat capacities all show negative deviations from the limiting Debye-Hückel law for 2:1 electrolytes. These excess functions cannot be explained through association or structural interactions and suggest that, at higher concentrations, this rigid bolaform electrolyte may behave more like a 1:1 electrolyte than a 2:1 electrolyte.
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