Compounds of Phosphoric Acid ivith Aniline. 13 



liquid becomes solid. This salt cannot be dried at 100° C. 

 (212° F.), because at this temperature it gives off aniline, 

 assuming a red colour. It melts at a gentle heat, and upon 

 raising the temperature gives off its aniline and leaves meta- 

 phosphoric acid. 



Analysis. 



When burnt with oxide of copper — 



I. 0*419 grm. of the substance gave 0*774 grm. of carbonic 

 acid and 0*227 gnn. of water. 



II. 0*646 grm. of the substance gave 1*183 grm. of carbonic 

 acid and 0*356 grm. of water. 



III. 1 grm. neutralized with ammonia and precipitated with 

 nitrate of silver, gave 1*461 grm. of tribasic phosphate of silver. 



These numbers correspond with the following per-cents. : — 



I. IT. III. 



Carbon .... 50*38 49*94 



Hydrogen . . . 6*01 6*19 

 Phosphoric acid . ... ... 24*86 



These determinations lead to the following formula, 



2(H0, CiaH^N) HO, PO5, 



as is seen by the following : — 



24 eqs. Carbon .... 1800*00 50*57 



17 ••• Hydrogen . . . 212*50 5*97 



2 ... Nitrogen .... 354*10 9*97 



3 ... Oxygen .... 300*00 8*42 

 1 ... Phosphoric acid . 892*28 25*07 

 1 ... Phosphate of anihne 3558*88 100*00 



Therefore the salt corresponds to the common phosphate of 



soda^ 2NaO, HO, PO5, 



and also to an ammonia salt of the same constitution. 



It is anhydrous, like this ammonia salt ; but, unlike these 

 salts, possesses, as before remarked, an acid reaction, like all 

 the other salts of aniline, this base being incapable of destroy- 

 ing the properties of an acid. 



2. Phosphate with 1 equiv. of Aniline and 2 equivs. of Water, 



This compound is obtained by adding tribasic phosphoric 

 acid to the salt mentioned before until it ceases to produce a 

 precipitate with chloride of barium, and concentrating in the 

 water-bath. In the coiu*se of a few hours the salt crystallizes 

 in beautiful silky needles; these are to be washed with aether 

 and dried on a warm tile. 



When dry the salt is quite white, but by exposure to the 



