SULPHURIC ACID 263 



AciDUM SuLPHUKiccM. Sulphuric Acid. H^SO^. 

 (U. S. & B. P.) 



Synonym. — Oil of vitriol, E.; acide sulphurique, huile 

 de vitriol, Fr.; scli-wefelsaure, vitriolol, G. 



A liquid composed of not less than 92.5 per cent, by 

 weight of absolute sulphuric acid, and not more than 7.5 per 

 cent, water. 



Derivation. — Sulphurous anhydride (U. S. P.), generated 

 by roasting iron pyrites, or sulphur, is passed into leaden 

 chambers. Nitric acid is introduced with steam, and the 

 sulphurous anhydride undergoes oxidation and hydration. 

 2 HNO3 + 2 SO, + H,0 = 2 H,SO, + N.O,. 



The nitrous acid combines with oxygen and water in 

 the air, and is re-transformed into nitric acid, acting con- 

 tinually as a carrier of oxygen to sulphurous anhydride. 



Properties. — A colorless liquid, of oily consistence, ino- 

 dorous, and very caustic and corrosive. Spec. gr. not below 

 1.835. Miscible, in all proportions, with water and alcohol, 

 with evolution of so much heat that the mixing requires 

 great caution. (U. S. P.) 



Incompatibles. — Alkalies and carbonates, calcium and 

 lead salts. 



PREPARATIONS. 

 ACIDUM SULPHDEIOUM DiLUTUM, AOIDUM SULPHURICUM AKOMATICUM. 



Acidum Sulphuricum Dilutum. Diluted Sulphuric Acid. 

 (U. S. & B. P.) 



Derivation.— Bn\p\mTio acid, 100 gm.; distilled water, 835 gm. 



Proper-fies. — Diluted sulphuric acid contains 10 per cent., hy 

 weight, of absolute sulphuric acid. Spec. gr. about 1.070. (U. S. P.) 



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

 Sw. & D., Tilx.-xxx. (.6-3). 



Acidum Sulphuricum Aromaticum. Aromatic Sulphuric Acid. 

 (U. S. & B. P.) 

 Synonym.— Tinotnra, aromatica acida, P. G.; elixir vitrioli Myn- 

 Bichti, elixir of vitriol, E.; elixir vitriolique, teinture (alcool) aromatique 

 sulphurique, Fr.; saure aromatische tinctur, Mynsiclit's elixir, G. 



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