Reilly & HiCKiNBOTTOM — Concentration of Alcoholic Liquors. 245 



mixture of minimum boiling point indicates feeble attraction between the 



unlike molecules. 



A more likely explanation may, however, be suggested to explain the 



results obtained. It is probable that the changes of concentration may bring 



variations in the " mass of water per c.c. in distillate." Any variation in 



this quantity will cause A to vary, even though Nernst's law still holds; we 



have 



1 ' , initial amount of alcohol 



A = 



log,, 



volume distilled ^''°'" amount of alcohol distilled' 

 and li is related to A thus — 



. , , c, nr^^n 7 Hiass of Water pcr c.c. in distillate 



A X constant volume in llask x 2,'6\}lb = k. 5 r? -„ 7 ■ — ?, — \ — • 



density or water vapour in flask 



If variations exist, it might be more satisfactory — instead of calculating 



from the total distillate as shown in Table I— to calculate A from each 



separate fraction. This we can do, since the volume is kept constant. 



Table VI gives the new results then obtained. 



Table VI. 



The mass of water per c.c. has been calculated from our analyses and 



A 

 from density tables. The value of — , it will be observed after correction, 



gives practically the same value as for dilute solutions, for which a = 

 1 approx. 



If we take the mean values, omitting first and last determinations, we 



A 



get-, 



first set (0-81) .... 0-0208, 

 second set (4-81) .... 0-0204. 



