ACTION OF THE HALOGENS^ ETC. 178 



molecules of water of crystallization, which, as in the case of the 

 nitric acid salt of thiochinanthrene, can not be determined directly, 

 since the salt decomposes between 80° and 100°. 



Nitrogen Determination. 



.1542 grms. substance gave 18.2 c. c. N. at 734.5 m. m. and 20.5°. 



Computed : Found : 



C,H,,N,S,,4HN03,2H30, 



N=13.05%. 13.04%. 



Acid Determination. 



.2004 grms. substance after boiling with water required 11.67 c. c. 

 of a .113B N. Ba(OH), solution. 



Computed: Found: 



4HN03=41.44%. 41.67%. 



Sulphuric Acid Salt, 



From a solution of the base in strong sulphuric acid, the salt 

 crystallizes in the form of red-brown needles. 



Acid Determination. 



.1674 grms. substance after boiling with water required 11.4 c. c. of a 

 .1136 N. Ba(OH), solution. 



Computed : Found : 



CjgHjjNjSj, 211280^, 

 2Hio,=37.98 % . 37.91 % . 



Hydrochloric Acid Salt. 



A stream of dry HCl precipitates microscopic needles of the 

 scarlet HCl salt from a hot xylene solution. These change to a yel- 

 low modification by standing in the air, water of crystallization being 

 taken on. By slightly heating them they may be changed back to 

 the scarlet form. The yellow form crystallizes out from a solution of 

 the base in aqueous hydrochloric acid. 



