416 



Dr. J. Stenhouse on Nitro- substitution [Mar. 30, 



I. *384 grm. substance gave -4 1 2 grm. carbonic anhydride and *043 grm. 

 water. 



II. *4 1 8 grm. substance gave -451 grm. carbonic anhydride and 

 •05 1 grm. water. 





Theory. 



I. 



II. 



Mean. 



C 6 = 



72 = 29-39 



29-27 



29-43 



29-35 



H a = 



3 = 1-23 



1-30 



1-36 



1-33 



N,= 



42 = 17-14 









o e = 



128 = 52-24 











245 lOO'OO 









This corresponds to the formula C 6 H 3 (N0 2 ) 3 2 , that of trinitro- 

 resorcin. 



Barium trinitro-resorcinate was prepared by dissolving trinitro-resorcin 

 in 100 parts boiling water and adding an excess of baric carbonate. The 

 filtered solution, on cooling, deposited the barium compound in minute 

 rhomboidal plates of a pale yellow colour. It is much more soluble than 

 the corresponding trinitro-orcin compound. The crystals contain three 

 equivalents of water of crystallization, which they do not lose at 100° C. ; 

 but when gently heated on platinum foil they assume an orange-red colour 

 from the loss of water of crystallization, and at a higher temperature ex- 

 plode with extreme violence, perforating the foil. Both trinitro-orcinic and 

 resorcinic acids and their salts explode with far greater violence than picric 

 acid and its compounds. 



A barium determination of the nitro-resorcinate, dried at 100°, yielded 

 the following results : — 



I. -409 grm. substance gave -220 grm. baric sulphate. 



II. '444 grm. substance gave -239 grm. baric sulphate. 



Theory. I. II. Mean. 



C 6 = 72 



H 7 = 7 



Ba" = 137*2 = 31-59 31-63 31-66 31-64 

 N 3 = 42 



Qn - vr* 



434-2 



The formula is therefore 



C < H(N< ^}°,+3H 2 0. 



Lead trinitro-resorcinate. — The addition of a solution of acetate of lead 

 to an aqueous solution of trinitro-resorcinic acid gave a yellow gelatinous 

 precipitate of lead trinitro-resorcinate. It was found best, however, to pre- 



