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202 EXAMINATION OF A NAPHTHA FROM LIME-SOAP. 





Temperature of oil-bath, 

 Excess of weight of balloon, 

 Capacity of balloon, 

 Air remaining in balloon, 



Height of barometer, «*....♦•••• 



MS 



Density of vapor found, 



234o 



0.557 grm. 



213 c. c. 



c. c. 



765 mm. at 24° 



5.471. 



it 



« theoretical J (C22 H22) 5.325. 





Two determinations of its sp. gr., at 0,° gave respectively 0.7902 and 0.7916. 



Law-ylene = C^ H24. After the first distillate from the crude lime-soap naphtha 

 had been eight or ten times redistilled, the quantities of residue at 200° were so small 

 in comparison with the large retorts employed that it was found to be impracticable to 

 continue the distillation to 220°, as had been originally proposed ; the larger portion of 

 the matter less volatile than 200° which was contained in the first distillate, was conse- 

 quently set aside as a highly impure residue at an early period. After a while, how- 

 ever, when smaller retorts were employed, the distillation of the products then in hand 

 wa curried as high as possible, and a small, very flat heap was finally obtained at 

 208°-212°. 



Although there was still considerable doubt whether this heap had been distilled suf- 

 ficiently, it was thought best to examine it as it stood. It was consequently treated 

 with the diluted sulphuric acid, and subsequently analyzed, as follows : The first, second 

 and third portions of acid blackened very much, the third portion less than the 

 others, a faint odor of mint being meanwhile developed ; the fourth and fifth portions 

 of acid blackened much less than the preceeding, and the sixth was but little colored. 

 The hydro-carbon was then washed, dried, and boiled with sodium, as usual. 



The largest degree-fraction of the purified product boiled at 212.6° (corrected.) 



On combustion (I.), 0.1481 grm. of it gave 0.1735 grm. water, and 0.4715 g 

 carbonic acid. After having been again distilled over sodium several times, it , 



e ~~~~ « 



again analyzed (II.) as follows : 0.1463 grm. of it gave 0.1680 grm. water, and 0.468 

 grm. carbonic acid. Or, 





Found. 



L II. 



Theory. 



Carbon 86.83 87.22 C24 85.71 



Hydrogen 13.03 12.78 H24 14.29 



99.86 100.00 



100.00 



A determination of the density of its vapor gave the following result 









