Mr. Noad on the Action of Nitric Acid on Cymol. 23 



Compounds of Toluylic Acid. 



From the extreme difficulty of obtaining this acid in a state 

 of purity in any quantity, I have not been able to examine 

 as many of its salts as I could have wished; the follov/ing 

 will however serve to confirm its composition and establish 

 its atomic weight. 



Toluylate of Baryta. — The formation of this salt has been 

 already described ; I was unable to obtain it in a well-defined 

 crystalhne form. Its analysis yielded the following result: — 



0'7955 grm. gave 0"453 sulphate of baryta = 37'37 per 

 cent, baryta, agreeing very closely with the formula 



BaCCi^H^Og, 

 as indicated by the subjoined comparison : — 



Theorj'. Experiment. 



1 equiv. Anhydrous acid 127 



1 ... Baryta ... 76 37-44 37*37 



Toluylate of Silver. — This salt was formed by dropping 

 nitrate of silver into a perfectly neutral solution of toluylate 

 of ammonia; it fell as a white curdy mass, which was 

 washed on a filter with cold water and purified by two or 

 three crystallizations out of boiling water : it crystallizes in 

 small needles. On analysing this salt the following numbers 

 were obtained : — 



I. 0'3785 grm. burned with oxide of copper gave 0*544 

 grm. of carbonic acid and 0'1045 water. 



II. 0"334 grm. ignited gave 0'1485 silver. 



III. 0*1725 grm. from another preparation gave 0*0767 

 silver. 



IV. 0*1705 grm. from a third preparation gave 0*0757 

 silver. 



These numbers correspond to the following per-centages : — 

 I. II. III. IV. 



Carbon . . 39*198 

 Hydrogen . 3*03 

 Silver . . . 44*46 44*46 44*4 



and lead to the formula AgO, Cjg Hy O3, as may be seen by 

 the following comparison : — 



Thcoiy. Experiment. 



16 equivs. Carbon . ... 96 

 7 ... Hydrogen ... 7 



4 ... Oxygen ... 32 

 1 ... Silver .... J^ 

 1 ... Toluylate of silver 243 100*00 



