242 



Scientific Proceedings^ Royal Dublin Society. 



and is, therefore, inversely proportional to the initial volume of liquid 

 distilled. The distillation coefficient varies (but to a less extent) with the 



1 



It IS 



concentration, and, therefore, in indicating the values of — log , 



V ^ a - X 



necessary to specify the initial volume distilled and also the concentration. 

 The values recorded in Tables I and II have initial volumes of 200 c.c, this 

 volume having been found to be a convenient one to work with in the case 

 of the alcohols. As, however, in the work on the fatty acids volumes of 

 150 c.c, were employed, the values of the coefficient obtained on the 

 distillation of 150 c.c. of the alcohols are given in Table III for comparison. 



Table III. 



Even with the variation in concentration, it will be seen that the results 

 of the two series of experiments at 150 c.c. and 200 c.c. initial volume, 

 confirm that the distillation figures are inversely proportional to the volume. 



Comparison of Values for the Coefficient of Enrichment /r(Sorel). 



for ethyl alcohol have already (see above) 



The values of — log 



V ° a - X 



been calculated for two concentrations of the alcohol (0-81 per cent, and 

 4-81 per cent.), and an appreciable difference is observed between the two 

 sets of results. In order to correlate the variation in the distillation co- 

 efficient with the coefficient of enrichment, a more extended series of 

 solutions was studied. The concentrations of ethyl alcohol varied between 



1 , « 



4'38 per cent, (by weight) and 0-24 per cent. The values of — log 



for 



each concentration were determined, and the corresponding values of K 

 calculated. The values obtained are recorded in Table IV. 



