Drs. Muspratt and Hofmann on Toluidine. 189 



An alcoholic solution of this base solidifies almost immediately 

 when mixed with most acids, and in order to obtain the salts 

 in good crystals it is only necessary to employ water or spirits 

 of wine as the solvent. The compounds are inodorous, and 

 with the exception of the palladium and platinum salt co- 

 lourless. When they are exposed, particularly in a moist 

 state, to the air, they acquire a pinkish hue like the aniline 

 compounds. They are decomposed by the caustic or car- 

 bonated alkalies and ammonia with the greatest facility; the 

 toluidine separating in crystalline grains. 



The constitution of the salts of toluidine resembles that of 

 the aniline and ammoniacal salts. 



Sulphate of tohndi?ie, SO3 + C14 Hg N, HO. — Toluidine 

 was dissolved in aether and then a few drops of sulphuric acid 

 added, when immediately a shining white crystalline precipi- 

 tate appeared, which was collected on a filter and edulcorated 

 with more of the solvent. This salt is difficultly soluble in 

 alcohol, but more readily dissolved by aether. 



Anali/sis. 



0'4'102 grm. of sulphate of toluidine gave 0*3015 grm. of sul- 

 phate of barytes = 25*22 per cent, sulphuric acid. 

 This determination agrees with the formula 



S03+C,4H9N, HO, 



as the subjoined comparison shows. 



Theory. Found. 



t * » 



1 equiv. Sulphuric acid 500*00 25-60 25*22 



1 ... Toluidine . . 1339*50 68*67 

 I ... Water . . . 112*50 5*73 



1952*00 100-00 

 Binoxalate of toluidine , 2 Cg 03 + 0,4 Hg N, HO + 2 a'q. 

 — The salt obtained on mixing a solution of toluidine in 

 alcohol with an excess of oxalic acid is a binoxalate. It ap- 

 pears in silky needles, which are sparingly soluble in cold 

 water and alcohol and quite insoluble in aether. This salt is 

 more readily dissolved b}- spirits of wine and boiling water. 

 The solution has a strong acid reaction and a saline unplea- 

 sant styptic after-taste. The combustion of this compound 

 with chromate of lead afforded the following numbers : — 



0*3975 grm. of the oxalate gave 0*7575 grm. carbonic acid 

 and 0-2120 grm. of water. 

 Centesimally, — 



Carbon . . . . 51*99 

 Hydrogen ... 5*90 



