and Attached Water. 



107 



§ 245. Sulphate of Aniline. — This salt was recrystallized 

 three times, and after drying between blotting-paper was 

 finally dried before a brisk open fire. As a cryogen it showed 

 a temperature of — o, 8. Of the solution saturated at 13°*1, 

 it was found that 25*6925 grams gave 1*5000 dry residue, or 

 5*84 per cent. Of the solution saturated at 0° C, 8*8675 grams 

 gave 0*4357 gram, or 4*91 per cent. The solidifying tempe- 

 rature of the cryohydrate was found to be — o, 9, and 9*5607 

 grams of it gave 0*4620 gram dry salt, or 4*83 per cent. This 

 salt appears to melt in its water of crystallization, and takes a 

 long time to dry. The following table contains the above 

 results, together with the temperature of initial solidification 

 in solutions of several strengths. The sparing solubility of 

 the salt limits the table very much. 



Table LIT. 



Sulphate 





Temperature 





of aniline 





at which 



Nature of 



per cent. 



by weight. 



solidification 



solid. 



by weight. 



begins. 





1 



99 



o 



- o-i 



Ice. 



2 



98 



- 0-2 





45 



95-5 



- 6 





4-83 



95-17 



- 0-9 



Cryohydrate. 



4-91 



95-09 







Salt. 



5-84 



94-16 



+ 13-1 





15 35 



84-65 



1000 



>» 



The curve representing this table is found in fig. 2. 



§ 246. Oxalate of Aniline. — 8*3230 grams of the oxalate 

 of aniline saturated at 14°*5 gave 0*1080 gram dry salt, or 

 1*29 per cent. At 0° I obtained 0*0320 gram of the dry salt 

 from 10*8170 grams solution, which means only 0*29 per 

 cent. The cryohydrate was formed at the very high tempe- 

 rature of — 0°*4. On evaporation, 8*5450 grams gave 0*02 

 gram dry salt, or only 0*14 per cent. The sparing solubility 

 of the salt in water prevented me from examining solutions 

 of strengths weaker than the cryohydrate. 



Table LIU. 



Oxalate 

 of aniline 



per cent, 

 by weight. 



Water 

 per cent, 

 by weight. 



Temperature 



at which 



solidification 



begins. 



Nalure of 

 solid. 



014 



029 

 1-29 



99-86 

 99-71 

 98-71 



o 



- 0-4 

 



+ 14-5 



Cryohydrate. 

 Salt. 



