412 



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



II. "306 grm. substance gave '366 grm. carbonic anhydride and '060 

 grm. water. 



III. *525 grm. substance gave '629 grm. carbonic anhydride and *096 

 grm. water. 



Theory. I. II. III. Mean. 



C 7 = 84= 32-43 32-58 32-63 32-68 32-63 



H 5 = 5 = 1-93 2-06 2-18 2-03 2 09 

 N,= 42= 16-22 

 8 =128= 49-42 



259 100-00 



These results correspond to the formula C 7 H. (N0 2 ) 3 , that of 

 trinitro-orcin. It is a powerful acid, much resembling picric acid, but 

 distinguished from the latter by the greater solubility of its salts. I pro- 

 pose, therefore, to call this new substance trinitro-orcinic acid. 



Potassium trinitro-orcinate. — This was readily prepared from trinitro- 

 orcinic acid by dissolving it in a warm and rather concentrated solution of 

 potassium carbonate. On cooling it solidified to a crystalline mass of fine 

 needles of a deep orange colour, which after the removal of the mother- 

 liquors by the vacuum filter, or by pressure, was purified by crystallization 

 from hot water, in which it was very soluble. The salt dried at 100° was 

 submitted to analysis. 



I. '300 grm. substance gave -155 grm. potassium sulphate. 



Theory. I. 



C 7 = 84 

 H 3 = 3 



K 2 = 78-2 = 23-38 23-19 



N 3 = 42 



8 =128 



335-2 



The result obtained agrees with formula 

 C 7 H 3 (NO,), I o 



Sodium trinitro-orcinate. — This was obtained by adding trinitro-orcinic 

 acid to a strong solution of sodium hydrate or carbonate until nearly 

 neutralized, and purifying by recrystallization. It forms orange-coloured 

 microscopic needles, strongly resembling the potassium salt. 



Ammonium trinitro-orcinate was prepared by adding trinitro-orcinic acid 

 to moderately strong ammonia, in quantity insufficient to neutralize it, boil- 

 ing for a short time, and then setting aside to crystallize. It forms deep- 

 yellow silky needles, which are very soluble in water, but much less so in 

 alcohol. 



