==Preparation== Sodium sulfite can be prepared in lab by reacting sodium hydroxide solution with sulfur dioxide gas: Evolution of SO2 by adding few drops of concentrated hydrochloric acid will indicate if sodium hydroxide is nearly gone, turned to aqueous sodium sulfite: Sodium sulfite is made industrially by reacting sulfur dioxide with a solutio... Found on http://en.wikipedia.org/wiki/Sodium_sulfite
(from the article `sulfur`) ...and sulfuric acid, are of considerable importance to the chemical industry. Sulfurous acid, H2SO3, is produced when sulfur dioxide is added to ... Found on http://www.britannica.com/eb/a-z/s/119
Na2SO3-7H2O;has been used for the relief of intestinal fermentation, and externally for aphthous stomatitis. ... (05 Mar 2000) ... Found on http://www.encyclo.co.uk/local/20973