Abstract
Proton magnetic resonance relaxation time measurements have been carried out in mixtures of water with formic acid, acetic acid, propionic acid and n-butyric acid. On account of molecular association, the results reveal strong deviation of these mixtures from the ideal behaviour. The molecular association effect is discussed in some detail. The molecular association ratios determined from the present studies are in excellent agreement with those obtained by the ultrasonic absorption technique. It is further shown that N.M.R. relaxation time studies reveal more information about molecular interactions in liquids than the ultrasonic absorption studies.
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