300 



C. L. Sj)eyers — Solubilities of Some Carbon 





Toluene. 







Chloral 





Urethane. hydrate. p-Toluidin. Naphthalene. 



0-0° 



0-88'72 0-0° 0-8978 0-0° 



0-9110 0-0° 0-9124 



18-4° 



0-8792 18-5° 0-9328 16-6° 



0-9228 17-9° 0-9130 



34-0° 



0-9570 28-4° 1-069 29-4° 



0-9430 36-2° 0-9224 



45-2° 



1-042 40-8° 1-448 40-7° 



0-9616 51-6° 0-9374 





42-0° 1-445 



73-9° 0-9692 





Phenanthrene. Acenaphthene. 



Toluene (pure). 





0-0° 0-9254 0-0° 0-9066 



0-0° 0-8840 





18-3° 0-9337 13-3° 0-9076 



17-6° 0-8678 





37-9° 0-9515 32-3° 0-9196 



32-1° 0-8544 





60-1° 0-9890 57-2° 0*9502 



49-8° 0-8381 





86-3° 1-038 83-5° 1-006 



65-9° 0-8232 

 85-0° 0-8048 



Of these solutions, so far as thej conld be examined, only 

 the following contain solutes with normal molecular weights.* 



Frea 



in 





water 



at 32° to 41 







methyl 

 ethyl 



alcohol 



u 28° 



a 27° 



Acetanilid 





methyl 

 ethyl 





" 31°(?) 

 " 21° to 42 



Naphthalene 





toluene 





a 28° " 45 

 '' 29° " 45 



Acenaphthene 





propyl alcohol 

 toluene 



" 45°(?) 

 " 21° to 51 



Selecting 27° as the temperature and taking solubilities at 

 that temperature from solubility curves and densities from 

 density curves, we get the following table: 



Solution. Solubility. 



Urea in water 26 grmraols 



" methyl alcohol 12 *' 



" ethyl " 5 " 



Acetanilidnn methyl alcohol 12 " 



" ethyl " 11 



Naphthalene in ethyl alcohol 4 " 



" " toluene 25 " 



Acenaphthene in propyl alcoh'l 1 " 



*^ toluene 18 " 



The osmotic pressure is not at all constant for each solute, 

 and we see that the undissolved solute does not balance the 

 dissolved solute to an equal extent in each solvent though the 

 molecular weights of the solutes are simple. So the analogy 

 of solution to vaporization is seen to be far from complete. 



* This Journal, 1. c. 





Osmotic 



)ensity. 



Pressm-e. 



1-155 



10-4 atmos 



0-873 



3-0 " 



0-805 



0-9 " 



0-891 



2-4 " 



0-858 



1-7 " 



0-810 



0-7 " 



0-918 



2-3 " 



0-810 



0-1 " 



0-918 



1-7 " 



