Abstract
Abstract Viscosities of aqueous solutions of sodium salts of formic acid, acetic acid, propionic acid, and butyric acid were measured in the concentration range 0.01–0.1 mol dm−3 at 15, 25, and 35°C For formate ion, values of Bst, the increment of viscosity B-coefficient arising from structural change of water, and of (dBion⁄dT), the temperature dependence of ionic B-coefficient, are both nearly zero, indicating that formate ion is neither a structure maker nor a structure breaker. For the alkanoate ions the signs of Bst and (dBion⁄dT) are positive and negative, respectively. From these facts, alkanoate ions may be concluded to be hydrophobic structure making ions.
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