* 



190 EXAMINATION OF A NAPHTHA FROM LIME-SOAP 



and 0.4144 grm. carbonic acid (L). Another portion of 0.1168 grm. gave 0.1654 grm 

 water, and 0.3601 grm. carbonic acid (II.) — or, 



Found. 



I il 



Carbon 84.27 84.08 

 Hydrogen 15.74 15.75 



Theory. 



Cu 84 



Hie 16 



100.01 99.83 



100 



A determination of the density of its vapor resulted as follows : 



Temperature of balance, 



Temperature of oil bath, 



Weight of balloon, 



Capacity of balloon, 



Air remaining in balloon, 



Height of barometer, . 



Density of vapor found, 



18 

 150 



o 



o 



. 0.3795 grm. 



221 c. c. 

 Zee. 



757.2mm. a t 18° 



3.5616 



" " » theoretical (C14 His), 3.458 



The sp. gr. of the liquid was 0.7085 at 0°, and 0.6942 at 17.5°. 



Tohiok = C u H 8 . Next above the hydride of oenanthyl (98°), was a singularly 

 well-defined heap at 110°-111°. This body was more readily isolated — that is to 

 say, brought into such a state of equilibrium that its boiling point was almost absolutely 

 constant — than any of the other hydro-carbons which we have obtained from the lime- 

 soap-naphtha. Altogether, from 109°-112°, this heap amounted to about 440 c. c. Its 

 odor was that of toluole. 



The fraction 110 o -lll° was treated at once with monohydrated sulphuric acid. 

 The first portion of acid made the whole liquid dark-colored and became itself very vis- 

 cid, some heat being evolved. The second and third portions of acid also became dark- 

 colored, as did the fourth, though to a somewhat less extent. The fifth, sixth, and 

 seventh portions of acid were each allowed to act during twenty-four hours, but they 

 appeared to affect the hydro-carbon very little. The hydro-carbon was now very dark- 

 colored, but on the addition of a dilute alkaline solution it cleared up to a light-yellow 

 color. It was dried over chloride of calcium and distilled in an ordinary retort without 

 sodium. After about two-thirds of the liquid had come over colorless, the residue sud- 

 denly became black, its temperature rose rapidly, and much sulphurous acid was evolved. 

 The distillate being twice redistilled over sodium, the greater portion of it came over at 

 111 (corrected) in each instance. The product was, however, evidently still impure 

 for in each case a small residue of higher boiling point was obtained. The boiling point 

 above given is doubtless too high ; but we have deferred any reconsideration of this re- 



? 



