Abstract
The effect of NaCl, KCl, RbCl, KBr, and KI on the temperature corresponding to the sound velocity maximum (TSVM) of aqueous t-butanol has been studied. The structural contribution to the shift in the TSVM of aqueous t-butanol by the addition of alkali halides was found to be in the order NaCl > KCl > RbCl and KCl > KBr > KI, thereby indicating that Na+ > K+ > Rb+ and Cl− > Br− > I− in disrupting the hydrogen-bonded structure of water. The results also indicate an enhancement in the structure-breaking characteristic of both cations and anions in the presence of t-butanol. However, the order is the reverse of that found for pure water, i.e. Rb+ > K+ > Na+ and I− > Br− > Cl−. The results have been explained on the basis of hydrophobic–hydrophilic interactions prevalent in the ternary Systems.
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