and Attached Water. 



27 



Table XL VII. 

 Separation of Solids from Aqueous Solution of Diethylamine. 



Per cent, of 



Per cent, of 



Temperature 



of initial 

 solidification. 



Nature of 



Diethylamine. 



water. 



solid. 



5 



95 



o 



-11 



Ice. 



10 



90 



29 



»> 



15 



85 



52 



j> 



20 



80 



8-4 



y> 



21 



79 



91 





22 



78 



99 



}J 



22-5 (+0-2) 



77-5 (+0-2) 



11-0 



Cryohydrate. 



23 



77 



99 



Subcryohydrate. 



25 



75 



91 





30 



70 



8-3 



}5 



35 



65 



8-0 



„ (pure) 



40 



60 



8-2 



>j 



45 



55 



8-6 



a 



50 



50 



91 



n 



60 



40 



12-2 



it 



70 



30 



23-4 



» 



Diethylamine does not solidify in a carbonic-acid cryogen. 



§ 237. Triethylamine, N(C 2 H 5 ) 3 . Boils at 88°.— Viewed 

 as an anhydride, we should expect, a priori, to find a greater 

 difference between the physical properties of this body and 

 those of diethylamine than between those of the latter body 

 and ethylamine. Indeed, the difference might be expected to 

 be comparable with that existing between .the properties of 

 ethylamine and those of ammonia ; for the replacement of the 

 first and the last equivalent of hydrogen by ethyl would be 

 expected to effect a difference of kind, while the replacement 

 of two instead of one would effect rather an alteration in 

 degree. Be this as it may, the properties of triethylamine in 

 reference to water are quite exceptional, or at least very 

 remarkable. The solutions of strengths 5, 10, and 15 per 

 cent, yielded ice ; the latter and the 20 per cent, can be 

 employed for obtaining the cryohydrate, but the 20 per cent, 

 begins its solidification with the subcryohydrate. The soli- 

 difying temperature of the cryohydrate is — 3 0, 8 C. This 

 cryohydrate contains 19*15 of the anhydrous base. It may be 

 remarked that the hydrochloride of this base retains hydro- 

 chloric acid with such firmness that, even when heated to 

 incipient volatilization, it still remains acid*. 



* A few grains of chloride of triethyl-ammonium heated on a hot spatula 

 exhibit a beautiful phenomenon. The columns and whirls of white 

 smoke can be watched petrifying in the air to white soot without much 

 change of form. 



