208 INORGANIC AGENTS 



flavum), precipitated oxide of mercury, E.; oxyde de mercure 

 jaune (precipite), Fr.; pracipitirtes (Gelbes) quecksilber- 

 oxyde, G. 



Derivation. — Precipitate an aqueous solution of mercuric 

 chloride, 100, with caustic soda, 40 : HgOl, + 2 NaOH = 

 H^O + 2 NaCl + H,0. 



Properties. — A light orange-yellow, amorphous, heavy, 

 impalpable powder ; odorless, and having a somewhat met- 

 allic taste ; permanent in the air, but turning darker on 

 exposure to the light ; almost insoluble in water ; insoluble 

 in alcohol. 



PREPAKATIONS. 



Unguentum Sydrargyri Oxidi Flavi. Ointment of Yellow Mercuric 

 Oxide. (U. S. P.) B. P. 3 per cent. 

 Yellow mercuric oxide, 10 ; ointment, 90. 



Oleatum Hydrargyri. Oleate of Mercury. (U.S. P.) 



Hydrargyri Oleas. (B. P.) 



Yellow mercuric oxide, 35 ; oleic acid to make 100. (U. S. P.) 



Hydkaegiki Chlokidum; Coeeosivdm. Corrosive Mercuric 

 Chloride. HgCl,. (U. S. P.) 

 (Corrosive Chloride of Mercury, Corrosive Sublimate.) 



Synonym. — Hydrargyri perchloridum, B. P.; hydrargy- 

 rum birchloratum corrosivum, P. G.; hydrargyrum muriati- 

 cum corrosivum, hydrargyri bichloridum, sublimatus cor- 

 rosivus, sublimatum corrosivum, mercurius sublimatus 

 corrosivus, chloruretum (chloretum) hydrargyricum, per- 

 chloride of mercury, bichloride of mercury, E.; Deuto- 

 chlorure de mercure, sublime corrosif, chlorure mercurique, 

 Er.; sstzendes quecksilberchlorid, setzender quecksilbersub- 

 limat, G. 



Derivation. — Heat a mixture of mercuric sulphate, 20 ; 

 sodium chloride, 16; manganese dioxide, 1. Hg SO^ + 2 

 NaCl + MnO, = HgCl^ + Na, SO, + MnO,. The bichloride 

 sublimes and is condensed. 



Properties. — Heavy, colorless, rhombic crystals, or crys- 



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