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Ion-Association Reaction of Rb+ and Br− in 2- Methylpropan-2-ol + Water Mixtures

The molar conductivity of RbBr solutions in 2- methylpropan-2-ol (tert-butanol) + water mixtures at alcohol mass fractions of 0.70, 0.80 and 0.90 was measured at temperatures from 288.15 to 308.15 K at 5 K intervals. The limiting molar conductivity (lambda_o) and the ion-pair formation constant (K_A ) were determined by the Lee-Wheaton conductivity equation. Thermodynamic quantities, Gibbs energy (deltaGo), enthalpy (deltaHo) and entropy (deltaSo), for the ion-association reaction were derived from the temperature dependence of K_A ; the activation energy of the ionic movement (deltaH*) was derived from the temperature dependence of lambda_o. These values were compared with those obtained earlier for HBr and NaBr in the same mixtures

rubidium bromide; 2-methylpropan-2-ol + water mixtures; association to ion-pairs; thermodynamic quantities

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