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Thermodynamics of association reaction of rubidium bromide in 2-methylpropan-2-ol + water mixture with an alcohol mass fraction of 0.80

Molar conductivities of rubidium bromide electrolyte in 2-methylpropan-2-ol + water mixture with an alcohol mass fraction of 0.80 were measured in the temperature range from 288.15 to 308.15 K at 5 K intervals. The obtained data were analyzed by using the Fuoss-Hsia conductivity equation, but it was not possible to establish a reliable radius value of the formed ion-pairs (R). The calculations were therefore repeated by using the same equation with R = q(Bjerrum). The obtained association constants at different temperatures enable the determination of standard thermodynamic quantities for the discussed association reaction. Our aim was to determine whether it was possible to apply the mentioned equation to this system. Then, from the comparison with analogous data for HBr and NaBr electrolytes in the mixtures of the same composition, we wanted to establish the influence of the cation exchange on the thermodynamics of the ion-pair formation. Finally, by comparing the thermodynamic quantities of RbBr electrolyte in butanol-2-ol + water mixtures, we wanted to correlate a possible influence of the particular alcohol in the mixture on thermodynamic quantities of the association reaction.

thermodynamics, association reaction, rubidium bromide, 2-methylpropan-2-ol

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