CINEOL AS A SOLVENT IN CRYOSCOPY. 



471 



From these results the value of the constant (K) may be 

 taken as 6*7. This holds good for dilute solutions and for 

 unassociated solutes. 



Oineol itself does not appear to show any abnormal 

 behavious in these experiments, and molecular weight 

 determinations of cineol (as solute) dissolved in benzene 

 (solvent), gave a normal result for the molecular weight of 

 cineol. The values of the constant "K " for cineol in some 

 of the tables given above decrease with increasing concen- 

 tration of solute, but this is a peculiarity often noticed in 

 such freezing point experiments, and it may be taken that 

 the more correct value for the constant is that obtained 

 in the dilute solutions. 



The molecular weight of substances containing the group 

 hydroxyl, would be expected to be abnormal (too large) in 

 solution in cineol, as this abnormal character of such 

 solutes is noticed with other solvents. Vice versa, the 

 calculated values of "K" using the normal molecular 

 weights for alcohols should come out rather low. 

 TABLE VIII. 



Solute :- 



-Ethyl alcohol, C 2 H 6 0; m = 46. 



W = 16-90. 



w. 



Percentages of 

 solute. 



A 



K. 



0-1478 

 0-3834 

 0-6934 



0-875 



2-27 

 4-105 



1-113 



2-645 

 4-356 



5-8 

 5-4 

 4-9 



TABLE IX. 



Solute: — Butyl alcohol, C 4 H 10 O; m = 74. W 



18-02. 



w. 



Percentages of 

 solute. 



A 



K 



0-132 

 0-398 

 0-691 



0-732 

 2-21 



3-84 



0-60 

 1-744 



2-877 



6-1 

 5-8 

 5-5 



