Sodii Sulphis. Sodium Sulphite. NaSo3+ 7H2O = 251.58. Source. - Saturate a solution of Sodium Carbonate or Caustic Soda with Sulphur Dioxide gas. Na2Co3 + So2 = Na2So3+Co2.

Characters

Colorless, transparent, monoclinic prisms; odorless, and having a cooling, saline, sulphurous taste; efflorescent in air. Solubility.- In 4 parts of water.

Impurities

Sulphates and chlorides.

Dose, 5 to 60 gr.; .30 to 4.00 gm.