90 ON SOME PRODUCTS DERIVED FROM INDIGO-BLUE. 



0'296o grm. gave 0"7565 grm. carbonic acid and O'igao 

 grm. water. 



0-3615 grm. gave 0*19 15 grm. cKloride of platinum and 

 ammonium. 



These numbers lead to the formula C^s HigNO,o, which 

 requires 



Calculation. Experiment. 



C^^ 288 yo'oy 6970 



^29 29 T°S 7"2o 



N 14 3-40 3-32 



Ojo 80 1948 1978 



411 lOO'OO lOO'OO 



The substance, it will be seen, is formed by the union of 

 6 ats. of alcohol, 4 ats. of formic acid, and i at. of indigo- 

 blue, accompanied by the separation of 20 ats. of water, 

 since 



Indigo-blue AlJohol. Formic acid. 



C,,H,3NO,o+2oHO = Ci6H5NO,+6(C,HeO,)+4(C2H,OJ. 



The composition of the substance corresponding to E 

 was also determined, the results being as follows : — 



0"i96o grm. gave 0-4500 grm. carbonic acid and 0*0820 

 grm. water. 



0*3635 grm. gave 0*3250 grm. chloride of platinum and 

 ammonium. 



These numbers correspond with the formula CigHjiNOg ; 

 but the only formula which can lead to an explanation of 

 the manner in which the substance is formed, though it 

 gives a calculated composition not agreeing quite so well 

 with the experiment, is C^g H,j NOg, which requires 



Calculation, Experiment. 



C26 •— 156 63*15 62-61 



Hi3 13 526 4-64 



N 14 5-66 5'6i 



Os 64 2593 27-14 



247 lOO'OO ioo*oo 



Assuming this to be the correct formula, its formation 



