Question: what is the empirical formula of sodium tetrathionate?
Answer: Sodium tetrathionate is a salt of sodium and tetrathionate with the formula Na2S4O6xH2O. The salt normally is obtained as the dihydrate (x = 2). It is a colorless, water-soluble solid. It is one member of the polythionates, which have the formula [Sn(SO3)2]2-.