Mutiail Sohii'iUti/ of l/n/utds. 049 



^. Carbon disuipludt- and Lower Alcoliois. 

 Tlie followinir table shows a orradual cliange of the critical 

 temperature for the liquids, of the same nature as with 

 hexane. 



Tarlk VI I. — Carbon disulphide and Alcohol, 

 Critical temperatures of liquids. 



Carbon disulph 



ide and methyl-alcohol ... 



-I-40-5 (Rothmund). 



M >> 



„ ethyl 



-100 (Guthrie -14-4*). 



.. 



.. propyl „ 



-52° 



.. 



„ butyl ,, 



-80° 



h. Trlethylamine and Water. 



As discovered by Guthrie f, trlethylamine and water have 

 a lower critical point for the liquid layers ; the mixture is 

 liomogeneous at ordinary temperatures and on being warmed 

 to 18° C. or 19° C. suddenly splits into two layers, the lower 

 one of which is chietiy water and the upper principally tri- 

 ethylamine. In some unaccountable manner Guthrie obtained 

 a completely impossible saturation-curve (t-^) for these 

 mixtures, but Rothmund J repeating the experiments found 

 a normal curve, as required by the phenomena. It seemed 

 worth while testing the effect of pressure on the miscibility 

 in this case. Some trlethylamine was prepared from the 

 chlorhydrate (Kahlbaum) and powdered potash, and re- 

 peatedly washed with water. The critical point was found 

 to be at 18°'3 C. In the pressure apparatus the following 

 readings were taken : — 



Table VIII. — Trlethylamine and Water. 

 Critical points of liquids. 



Temp. 



Press, i 



Temp. 



Press. 



18-3 



1 

 



200 



70 



18-45 



0-5 1 



21-2 



140 



1003 



(;;} : 



21-3 



144 



19-95 



78 



213 



140 



* Guthrie, Phil. Mag. (o) vol. xviii. p. 504. 



t Guthrie, Phil. Majr. (5) vol. xviii. pp. 28, 59. 



\ Kothinimd, Zeitnh. Phi/sik. Chemie. vol. xxxvi. pp. 450-4(-)l. 



