PHOSPHOEIO ACID 265 



of hydrochloric acid. The mixture should remain in an open bottle not 

 more than half full, until the fumes pass off. 



Dose.— H., mxx.-xl. (1.3-2.6); D., niii.-v. (.2-.3). 



III. Acidum Nitrohydrochlorioum Dihitum. Diluted Nitrochlorio Acid, 



(U. S. & B. P.) 

 {Diluted Nitromuriatio Acid.) 



Synonym. — Acidum chlorp-nitrosum, P. G. ; aqua regia S. regis, — 

 acide chloro-azotique 8. chloro-nitreux, eau Regales, Fr.; salpetersalz- 

 saure, konigswasser, G. 



Derivation. — Nitric acid, 40; hydrochloric acid, 180; distilled 

 water, 780. 



Properties. — A colorless, or pale yellowish liquid, having a faint 

 odor of chlorine and a very acid taste. Completely volatilized by heat. 

 (U. S. P.) 



Dose.— H., 3i.-ii. (4.-8.); 0., 3ii.-iv. (8.-15.); Sh., 3 ss.-i. (3.-4.); 

 Sw. & D., mv.-xxx. (.3-2.). 



Acidum Phosphokicum. Phospliorio Acid. HsP O^v 



(U. S. & B. P.) 



A liquid composed of not less than 85 per cent., hy 

 weiglit, of absolute orthophosplioric acid (H^P O^), and not 

 more than 15 per cent, of water. (U. S. P.) 



Derivation. — Heat phosphorus with diluted nitric acid 

 till nitrous fumes cease. P3 4- 5 HNO3 + 2 H,0 = 3 H, 

 PO, + 5 NO. 



Properties. — A colorless liquid, without odor, but having 

 a strongly acid taste. Spec. gr. not below 1.710. Miscible, 

 in all proportions, with water or alcohol. (U. S. P.) 



PEEPARATION. 



Acidum Phosphoricum Dilutum. Diluted Phosphoric Acid. 

 (U. S. & B. P.) 



Derivation.— Fhosphozic acid, 100; distilled water, 750. (U. S. P.) 

 Diluted phosp|ioric acid contains 10 per cent., by weight, of absolute 

 orthophosphoric acid. Spec. gr. about 1057. 



Dose.-n., 3i.-ii. (4.-8.); C, 3ii.-iv. (8.-15.); Sh., 3ss--. (3.-4.),- 

 D., mv.-xxx. (.3-2.) 



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