VISCOSITY MEASUREMENTS OF ACIDIC e AG-UOUS SOLUTIONS AS A FUNCTION OF TEMPERATURE

Abstract

Relative viscosities for formic, acetic, propionic and butyric acids in aqueous s olutions were determined using a thermostated Ubbelohde flow viscometer in the temperature of 250 C to 650C.From th e experimental results, excess viscosities 1E , excess volumes 6VE and flow activation energies E1 were calculated using Arrhenius type and Eyring type equations . Free energy of activation ~G~, activation entropy ~S.:j; and activation enthalpies .6.H~ were a lso evaluated. Explanations of these quantities in terms of acid-acid, ac idwater and water-water inte ractions have been given with special e mph a s is on h ydrogen bonding in solutions .