APPARENT MOLAL COMPRESSIBILITIES OF ALCOHOLS IN AQUEOUS-SOLUTIONS AT DIFFERENT TEMPERATURES

Apparent molal compressibilities (phi(k)) of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl alcohols in aqueous soluti ons are reported at 2, 4, 6, 8 and 10 degrees C. The variation of phi( k) with concentration (m) has been interpreted in terms of effect of d issolved solute (alcohol) on water structure. The limiting apparent mo lal compressibilities (phi(k)(0)) of alcohols are also reported and in terpreted in terms of hydrophobic interactions. in addition, parameter P-theta = (partial derivative/partial derivative P) (Delta theta(str) ), where Delta theta(str) is the structural contribution of shift in t emperature of maximum density (Delta theta), has been calculated as a function of concentration. It has been observed that P-theta can very well be used as a tool to express the relative structure strengthening ability of dissolved alcohols in water.