Volume Changes attending Mixture, 



513 



§ 276. Laid out graphically we get accordingly the curve B, 

 fig. 6. Perhaps the most notable character of this curve is 

 its descent at the upper right end. This means that, although 

 bisulphide of carbon has a lower vapour-tension than ether, a 

 little bisulphide loosens the ether and raises the vapour-tension. 

 The effect on the vapour-tension of the liquid brought about 

 by the addition of a little ether to the bisulphide is much more 

 marked. 



Vapour-tensions of Mixtures of Chloroform and Bisulphide 

 of Carbon. 



§ 277. Referring again to Table LXI. it is seen that, with 

 whatever of the liquids there examined bisulphide of carbon 

 is mixed, expansion occurs and the temperature is lowered. 

 With chloroform these results are very marked ; and having 

 examined the relationship between bisulphide and ether and 

 between chloroform and ether, let me describe the relationship 

 between chloroform and bisulphide of carbon. 



Table LXVI. a. 



Vapour-tensions of Mixtures of Chloroform and Bisulphide 

 of Carbon. 







T = 16°-0C. 





Chloroform, 



Bisulphide 

 of Carbon, 



Mercurial 



Liquid 

 above 



Vapour-tension, 

 in millim. 



per cent, 

 by weight. 



per cent, 

 by weight. 



depression, 

 in millini. 



mercury, 

 in millim. 



of mercury, 

 at 16°. 







100 



269 9 



53-1 



264-8 



3 



97 



271-8 



58-2 



266-2 



5 



95 



2775 



74-9 



270-4 



10 



90 



271-6 



57-8 



266-1 



15 



85 



272-3 



56-2 



266-8 



20 



80 



273-0 



61-9 



266-9 



30 



70 



270-7 



70-7 



263-7 



40 



60 



265-8 



60-2 



259-7 



50 



50 



260-3 



61-3 



254-0 



60 



40 



2496 



56-0 



243-7 



70 



30 



241-0 



60-0 



234-6 



80 



20 



227-9 



605 



221-4 



90 



10 



215-4 



80-8 



2066 



100 







176-2 



64-6 



169-2 



Spec. grav. of bisulphide of carbon, 1*23 ; of chloroform, 1*49. 



§ 278. On laying these numbers out graphically, the curve 

 C, fig. 6, presents itself. Although we are dealing here with 

 millimetres, the shape of the curve towards pure bisulphide 

 of carbon required confirmation. I therefore employed a 



