468 CAMPHOCARBONIC ACID. 



colorless prisms; insoluble in water; fuses at 80; 

 sublimes. 



Camphoric acid, C 10 H 16 O = C 8 H 14 (CO.OH) 2 , is pro- 

 duced by digesting, for a long time, and repeatedly 

 distilling camphor with 10 parts concentrated nitric 

 acid. Crystallizes from water in thin, colorless laminae, 

 of a weak acid taste, without odor. Fuses at ITS- 

 ITS , and emits a pungent odor. Difficultly soluble in 

 cold water, more easily "soluble in hot water and in 

 alcohol. "When heated it is decomposed into water and 

 camphoric anhydride, C 10 H 14 3 , which sublimes in long, 

 shiny prisms, and fuses at 21 T. 



Bibasic acid. The calcium salt, C 10 H 14 0'Ca + 8H 2 0, 

 forms easily soluble crystals ; when heated is resolved 

 into carbonic anhydride, water, and phoron (p. 109). 



Camphoronic acid, C 9 H 12 5 . Is formed, together 

 with the preceding compound, when camphor is heated 

 with nitric acid. Also by direct oxidation of cam- 

 phoric acid. Brilliant, white, microscopic needles; 

 very easily soluble in water, alcohol, and ether. When 

 fused with potassium hydroxide, it yields butyric acid. 



The substance, formerly described as camphresinic 

 acid, C 10 H 14 7 , is a mixture of camphoric and cam- 

 phoronic acids. 



Oxy camphor onic acid, C 9 H 12 6 + H 2 0, is obtained 

 by heating camphoronic acid with two atoms of bro- 

 mine in sealed tubes. Crystallizes in the monoclinate 

 system from water; easily soluble in alcohol, ether, 

 and water. Loses its water of crystallization at 100 ; 

 begins to melt at 210 ; distillable. Appears to be 

 triatomic, bibasic. Is decomposed by potassium hy- 

 droxide like camphoric acid. 



Campho carbonic acid, C n H 16 3 . Sodium acts 

 very violently, but without an evolution of hydrogen, 

 on a solution of camphor in toluene, and a yellowish, 

 amorphous mass is deposited, consisting of sodium- 



