Kinetics of solute-solvent interaction in aqueous solution of butyl carbitol by ultrasonic methods.

概要

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Ultrasonic absorptions in the frequency range 4.5–220 MHz and sound velocities at 2.5 MHz were measured at 25 °C with aqueous solutions of Butyl Carbitol (diethylene glycol monobutyl ether) over the concentration range 0.497–3.00 mol dm−3. Only a single relaxational process was observed and attributed to a perturbation of the equilibrium AB\oversetk12\undersetk21↔A+B, where A is Butyl Carbitol as the solute and B is water as the solvent participating in the reaction. A data analysis has led to the estimates k12=3.4×107 s−1, k21=2.0×108 dm3 mol−1 s−1, the standard volume change of reaction ΔV°=0.32 cm3 mol−1, and the standard enthalpy change ΔH°=5.4 kJ mol−1. The effect of the hydrophobicity of solute molecules on the water structure is discussed by comparing the present results with previous ones for other aqueous nonelectrolyte solutions.
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