312 



CHARACTERS OF THE 



three times its weight of water may be added. A 

 slight excess of zinc sulphate should prevail, so as 

 to completely precipitate the barium. The filtered 

 solution is evaporated and allowed to crystallise. 

 Copper 5z/^/20-(7tfrfo/tfte,Cu(C 6 H 5 )SO 4 . It is prepared 

 by neutralizing with cupric oxide. It forms brilliant 

 prisms of an emerald green colour. Iron Sulpha Car- 

 bolates. It is probable that iron forms two distinct 

 compounds with carbolic acid. Ferrous Sulpho-Car- 

 bolate, Fe(C 6 H 5 )SO 4 + Aq. is prepared by acting on 

 pure iron with sulpho-carbolic acid to neutralization 

 and evaporating. Ferric Sulpho-Carbolate, has not 

 been satisfactorily isolated. 



General Characters of the Sulpho-Carbolates and 

 Tests. Each sulpho-carbolate should possess a defi- 

 nite and decided crystalline form, and should be 

 perfectly transparent, entangling no organic debris. 

 These salts should possess scarcely any odour of car- 

 bolic acid. All should yield perfectly clear solutions, 

 which should give no precipitate with barium chloride. 

 If a few crystals be boiled for a few minutes with 

 nitric acid and then twice the bulk of water added, 

 Picric acid in yellow glistening scales is thrown down, 

 and the supernatant liquid gives a white precipitate 

 with barium chloride, showing that sulphuric acid is 

 liberated. If to a solution of a sulpho-carbolate, a drop 

 of a solution of a persalt of iron be added the clear liquid 

 assumes a beautiful purple or mauve colour. One six- 

 tieth of a grain of sodium sulpho-carbolate is capable 



