96 



OSBORNE, M'KELVY AND BEARCE I ETHYL ALCOHOL 



The low results obtained for the density of anhydrous ethyl 

 alcohol by Messrs. Squibb could not be obtained by a repetition 

 of their procedure. A repetition of the procedure of Mendel6ef 

 gave results closely agreeing with his. Tables are given showing 

 the comparison of results with those of former investigator?,. The 

 mean density of fifteen of the fractions regarded as the purest was 

 found to be 0.78506, at 25° C. 



Part II The thermal expansion of mixtures of ethyl alcohol 

 and water. N. S. Osborne. Twelve mixtures of alcohol and 

 water were prepared and their densities at 10°, 15°, 20°, 25°, 30°, 

 35°, and 40° C. determined by the method of hydrostatic weigh- 

 ing. The observations of density for each mixture were reduced 

 by the method of least squares and the coefficients of the assumed 

 equation 



D t = D 25 + a (t-25) + |8 (t-25f + y (t- 25) 3 

 determined. The values of Z) 25 , a, /3 and y for the twelve mixtures 

 are shown in Table I. 



TABLE I 



* Water according to Chappuis. 



The values of a, /3 and y for each integral per cent of alcohol 

 between and 100 were then obtained by interpolation. 



