RED MERCURIC OXIDE 161 



//. — Massa Hydrargyri. Mass of Mercury. (U. S. P.) 



Synonym. — Pilula hydrargyri, B. P.; blue mass, blue pill, pilulas coeruleae, E.; 

 pilule de mercure, Fr. ; mercurial pillen, G. 



Mercury, 83 Gm. ; oleate of mercury, 1 Gm.; glycyrrhiza, 10 Gm.; althasa, 15 

 Gm. ; glycerin, 9 Gm. ; honey of roses, 82 Gm. Contains not less than 32, nor 

 more than 34 per cent, of mercury in a state of line division. (U. S. P.) 



Dose.—D., gr.i-x, (.06-.6). 

 ///. — Unguentum Hydrargyri. Mercurial Ointment. (U. S. & B. P.) 

 (Blue Ointment.) 



Synonym. — Pommade mercurielle il parties egales, pommade Napolitaine, Fr- ; 

 quecksilbersalbe, G. 



Mercury, 500 Gm. ; lard, 250 Gm.; suet, 230 Gm.; oleate of mercury, 20 Gm. 

 Contains 50 per cent, of mercury. (U. S. P.) 



Hydrargyei Oxidum Rubbum. Red Mercuric Oxide. HgO. (U. S. & B. P.) 



Synonym. — Hydrargyrum oxydatum, P. G. ; peroxide of mercury, red precipi- 

 tate, mercuric oxide, E.; deuto-oxyde (peroxyde) de mercure, oxyde mercurique, 

 precipite rouge, poudre de Jean de Vigo, Fr. ; rothes queclcsilberoxyde, rother 

 prjtclpitat (quecltsilber-priicipitat), G. 



Derivation. — Dissolve mercury in diluted nitric acid. 



3 Hga+16 HN03 = 6 Hg (NOj)^. (Mercuric nitrate)-(-4 NO+8 H^O. 



Rub mercuric nitrate with metallic mercurj' and heat. 



2 Hg (N03).+Hg, = 4 HgO+2 NA- 



Properties. — Heavy, orange-red, crystalline scales, or a crystalline powder 

 acquiring a yellow color when finely divided; odorless, and having a somewhat 

 metallic taste; permanent in the air; almost insoluble in water; insoluble in 

 alcohol. 



PREPARATION. 



Unguentum, Hydrargyri Oxidi Rubri. Ointment of Red Mercuric Oxide. (B. P.) 



(Non-olficial.) 



Synonym. — Red precipitate ointment. Red murcuric oxide, 10; water, 10; 

 hydrous wool-fat, 40; petrolatum, 40. (U. S. P. 1905.) 

 Hydrargyri Oxidum Flavum. Yellow Mercuric Oxide. HgO (U. S. & B. P.) 



Synonym. — Hydrargyrum oxydatum via humida paratum, P. G. ; hydrargyrum 

 oxydatum prsecipitatum (vel flavum) precipitated oxide of mercury, E.; oxyde de 

 mercure jaune (precipite), Fr. ; priicipitirtes (gelbes) queclcsilberoxyde, G. 



Derivation. — Precipitate an aqueous solution of mercuric chloride, 100, with 

 caustic soda, 40: HgCl2-J-2 NaOH = HgO-|-2 NaCl-j-H^O. 



Properties. — A light orange yellow, amorphous, heavy, impalpable powder; 

 odorless, and having a somewhat metallic taste; permanent in the air, but turn- 

 ing darker on exposure to the light; almost insoluble in water; insoluble in alcohol. 



preparations. 

 Unguentum Hydrargyri Oxidi Flavi. Ointment of Yellow Mercuric Oxide. 



(U. S. P.) B. P. 2 per cent. 



Yellow mercuric oxide, 10; water, 10; hydrous wool-fat, 40; petrolatum, 40. 



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



Hydrargyri Oleas. (B. P.) 



Yellow mercuric oxide, 25; alcohol, 20; oleic acid to make 100. (U. S. P.) 



Hydrargyri Chloridum Coreosivum. Corrosive Mercuric Chloride. Hg. Clj. 



(U. S. P.) 



(Corrosive Chloride of Mercury, Corrosive Sublimate.) 



Synonym. — Hydrargyri perchloridum, B. P.; hydrargyrum bichloratum eor- 



rosivum, P. G.; perchloride of mercury, bichloride of mercury, E.; Deutochlorure 



de mercure, sublime corrosif, chlorure mercurique, Fr.; quecksilberchlorid, aetzen- 



der quecksilbersublimat, G. 



Derivation. — Heat a mixture of mercuric sulphate, 20; sodium chloride, 10; 

 manganese dioxide, 1. Hg S04-|-2 NaCl+MnO,= HgCl^+Na^SC-l-MnO,. The 

 bichloride sublimes and is condensed. 



Properties.— ^Heavy, colorless, rhombic crystals, or crystalline masses, or as « 

 white powder; odorless, and having characteristic and persistent metallic taste; 

 permanent in the air; soluble in 13.5 parts of water and in 3.8 parts of alcohol. 



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