SODIUM BISULPHITE 135 



Soluble in 4 parts of water ; sparingly soluble in alcohol ; 

 Neutral or feebly alkaline. 



Dose.—K. & C, 5i. (30.); Sh. & Sw., 3 ss.-i. (2.-4); D., 

 gr.v.-xxx. (.3-2.). 



SoDii Bisulphite. Sodium Bisulphite. NaHSOs. (U. S. P.) 



Dei'ivation. — Obtained from sodium carbonate or bicar- 

 bonate and sulphurous anhydride gas. 



Properties. — Opaque, prismatic crystals, or a granular 

 powder, exhaling an odor of sulphur dioxide and having a 

 disagreeable, sulphurous taste. Exposed to the air the salt 

 loses sulphur dioxide and is gradually oxidized to sulphate. 

 Soluble ia 4 parts of water and in 72 parts of alcohol ; reac- 

 tion acid. 



Dose. — Same as sodium sulphite. 



SoDii Hyposulphis. Sodium Hyposulphite. Na, S^Og 5 H^O. 

 (U. S. & B. P.) 



Synonym. — Sodium thiosulphate, hyposulphate of soda, 

 E.; natrum subsulf urosum (hyposulfurosum), P. G.; hyposul- 

 phis sodicus, hyposulfite de sonde, sulfite solfure de sonde, 

 Fr.; unterschwefligsaures natron, G. 



Derivation. — Dissolve sulphur in a boiling aqueous 

 solution of sodium sulphite. 



Properties. — Colorless, transparent, monoclinic prisms, 

 odorless, and having a cooling, afterwards bitter, taste. 

 Permanent in air below 33^ C. (91.4° F.), but efflorescent in 

 dry air above that temperature. Soluble in 0.65 part of 

 water ; insoluble in alcohol ; slightly soluble in oil of tur- 

 pentine ; reaction neutral. 



Dose. — Same as sodium sulphite. 



Administration. — The sulphites are given in solution, or 

 may be added in powder to the food of horses. 



ACTION OF the SULPHITES. 



Action External. — The sulphites are antiseptics, deodor- 

 izers and parasiticides externally. 



