H2SO3 >> H2O + SO2
water + sulfur dioxide
Decomposition Of Sulfurous Acid
Sulfurous Acid Chemical Formula
In a manner analogous to carbonic acid sulfurous acid decomposes H2SO3——– SO2 + H2O
carbonic H2CO3 —— CO2 + H2O
both CO2 and SO2 ( as well as SO3 ) are known as acid anhydrides in that they dissolve in water and react with the water to form an oxy acid.