172 INOBGANIC AGENTS 



Ceratum Plumbi Subacetatis. Cerate of Lead Subacetate. (U. S. P.) 

 Solution of lead subacetate, 30; camphor cerate, 80. 



Plumbi Caebonas. Lead Carbonate. (PbCOs);, Pb(OH)j. 

 (Non-official.) 



Synonym.— White lead, E.; ceruse, Fr.; bleiweiss, G. 



Derivation. — Expose lead to the action of acetic acid 

 vapor and air with carbonic dioxide. 



4 Pb + 2 HC^H^O, + 2 O, + 2 CO, = (PbCoa), Pb 

 (OH), + Pb(C,H30,),. 



Properties. — A heavy, white, opaque powder, or a pul- 

 verulent mass, without odor or taste. Permanent in air. 

 Insoluble in water or alcohol. Used only externally. 



Plumbi Nitbas. Lead Nitrate. Pb (NO^),. (U. S. & B. P.) 



Synonym. — Salpetersaures bleioxyd, bleisalpeter, G. 



Derivation. — Dissolve lead in nitric acid. 



Properties. — Colorless, transparent, octohedral crystals, 

 or white, nearly opaque crystals ; without odor, and having 

 a sweetish, astringent, and afterwards metallic taste ; 

 permanent in the air ; reaction acid ; soluble in 2 parts of 

 water ; almost insoluble in alcohol. Only used externally 

 in 1 per cent, solution as an astringent and deodorant in 

 gangrenous surfaces, etc. 



Plumbi Iodidum. Lead Iodide. Pb I,. (U. S. & B. P.) 



Derivation — Treat solution of lead nitrate with that of 

 potassium iodide. 



Pb (NO3), + 2 KI = Pbl, + 2 KNO3. Dry the pre- 

 cipitate. 



Properties. — A heavy, bright yellow powder, without 

 odor or taste ; permanent in the air ; soluble in about 2,000 

 parts of water ; very slightly soluble in alcohol ; used only 

 externally. 



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