## Chemistry 12th Edition

We know that sulphites are converted into sulphates by reaction with hydrogen peroxide. $SO_3^{-2}+H_2O_2\rightarrow SO_4^{-2}+H_2O$ Sulphate ions are treated with barium chloride to produce barium sulphate precipitate. The reaction is given as follows: $SO_4^{-2}+BaCl_2\rightarrow BaSO_4+2Cl^-$