BEHAVIOUR OF PERSULPHATE IN SULPHURIC ACID SOLUTIONS

Behaviour of persulphate in sulphuric acid solution of different concentrations has been studied by estimating its hydrolytic products, permonosulphuric acid and hydrogen peroxide. The method of estimation of these substances in presence of each other works well and the difficulty encountered by the previous workers has been solved. It is confirmed that first permonosulphuric acid and then hydrogen peroxide are formed as the concentration of sulphuric acid is increased. The graphical results show that there are two maxima for permonosulphuric acid and one for hydrogen peroxide. The second maximum for permonosulphuric acid proves that it is reformed at higher concentrations of sulphuric acid. The reaction between hydrogen peroxide and sulphuric acid has also been studied. The possibility of estimating persulphate in suitable concentrations of sulphuric acid, iodometrically and with permanganate, has teen indicated. The results are slightly different if the mixing of the reactants is reversed