LEAD ACETATE 171 



PREPARATION. 



Emplastrum Plumbi. Lead Plaster. (U. S. & B. P.) 

 (Diachylon Plaster.) 

 Lead oxide, 33; olive oil, 60; water, a sufficient quantity. Basis of 

 other preparations.' 



Plumbi Acetas. Lead Acetate. Pb (C,H30,), + 3 H^O. 



(U. S. & B. P.) 



Synonym.— Su^ar of lead, E.; sel (suore) de saturne, Fr.; 

 essigsanres bleioxyd, bleizucker, G. 



Dei-ivation.—'Kea.t lead oxide in acetic acid and water. 



PbO + 2 HaH,0, + 2 H,0 = Pb(C,H30,), + 3H,0. 

 Lead acetate crj'stallizes on cooling. 



Properties. — Colorless, shining, transparent, monoclinio 

 prisms or plates, or heavy, white crystalline masses, or 

 granular crystals, having a faintly acetous odor and a 

 sweetish, astringent, afterwards metallic, taste. Efflorescent 

 and absorbing carbon dioxide on exposure to the air. 

 Soluble in 2.3 parts of water and in 21 parts of alcohol. 

 Reaction slightly acid. 



Incompatibles. — Hard water, alkalies, mineral acids and 

 salts, potassium iodide, opium, vegetable astringents and 

 albuminous liquids. 



Z>ose.— H. & C, 3 i. (4.); Sh. & Sw., gr.xv.-xx. (1.-1.3); D., 

 gr.i.-ii. (.06-.12). 



PREPARATIONS. 



Made from lead acetate in which lead exists as the subaoetate, 



PbaO (CaHsOa)^. 



Liquor Plumbi Subacetatis. Solution of Lead Subaoetate. (U. S. P.) 

 Liquor Plumbi Subacetatis Fortis. (B. P.) 



Synonym. — Goulard's extract, acetum plumbicum, acetum Saturni, 

 plumbum hydrico-aceticum solutum, subacetas plumbious liquidus, E. ; 

 liquor plumbici subacetici, P. G. ; sous-acetate de plomb liquide, extract 

 de Goulard de vinaigre, plomb, Fr. ; bleiessig, G. 



Composition. — An aqueous liquid, containing in s&lution about 35 

 per cent, of lead subacetate (approximately), PbjO (CaHsOa)!. 



Liquor Plumbi Subacetatis Dilutus. Diluted Solution of Lead Subacetate. 



(U. S. & B. P.) 

 Synonym.— LeaA Water. Lead Subacetate, 3; water to make 100. 



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