White or yellow crystalline powder or small crystals, with a strong SO2 odor, the proportion of 1.4, soluble in water, aqueous solution is acidic, and strong acid contact will release SO2 and generate the corresponding salt, long in the air, then oxidized into Na2S2O6, so the product can not be long. Above 1500C, SO2 is separated.
White or yellow crystalline powder or small crystals, with a strong S02 odor, specific gravity 1.4, soluble in water, aqueous solution is acidic, and strong acid contact will release SO2 and generate the corresponding salts, long-term in the air, then oxidized into Na2S206, so the product can not be stored for a long time. Above 1500C, that is, the decomposition of S02.