196 INORGANIC AGENTS 



iodide is precipitated. Filter, wash and dry. HgClj + 2 KT 

 = Hgl, + 2 K CI. 



Properties. — A scarlet-red, amorphous powder ; odorless 

 and tasteless ; permanent in the air ; almost insoluble in 

 water ; soluble in 130 parts of alcohol. 



Unguentum Hydrargyri Nitratis. Ointment of Mercurie 

 Nitrate. (Citrine Ointment). 



Mercury, 70 gm.; nitric acid, 175 gm.; lard oil, 760 gm. 

 Properties. — ^^A lemon-yellow ointment 



Hydrargyrum Ammoniatum. Ammouiated Mercury. NH^. 

 HgCl. (U.S.<feB.P.) 



( White Precipitate^ Mercuric Ammonium Chloride.) 



Synonym. — Hydrargyrum prsBcipitatum album, P. G.; 

 hydrargyrum amidato-bichloratum (ammoniato-muriaticum),^ 

 hydrargyri ammonio-chloridum, mercurius pi secipitatus 

 albus, E.; oxychlorure ammoniacal de mercure, mercure pre^ 

 cipite blanc, Fr.; weisse quecksilber-pracipat, quecksilber- 

 chloridamidid, G. 



Derivation. — Mix an aqueous solution (1-20) of corrosive 

 mercuric chloride, 200, with ammonia water, 15. 



HgCl, + 2 NH.OH = NH, Hg CI + NH.Cl + 2H,0. 

 Filter, wash with diluted ammonia water (1-20), and dry tha 

 precipitated aramoniated mercury. 



Properties. — White, pulverent pieces, or a white, amor- 

 phous powder, without odor, and having an earthy, after- 

 wards styptic and metallic, taste ; permanent in the air ; 

 almost insoluble in water or in alcohol. 



PREPARATION. 



Unguentum Hydrargyri Ammoniati. Ointment of Ammoniated Mer- 

 cury. (U. S. & B. P ) 

 Synonym. —White precipitate ointment. Ammoniated mercury^ 

 10; benzoinated lard, 90. (U. S. P.) 



