oxidation: AsO33-(aq) + 2H+(aq) + H2O2(aq) = AsO43-(aq) + 4H2O Precipitation: AsO43-(aq)+ Fe+3(aq) + 2H2O = FeAsO42H2O (scorodite)

The feed solution has an average concentration of 20 g/l of arsenic and pH=0

a) obtain unitary consumption (Fe2(SO4)3) and H2O2, considering that the water oxygenated is acquired in a 50% solution by weight and 25% decomposes in other reactions parasitic, while ferric sulfate, while pure, must be added in excess of 25%. ( X kg/ kg As)

b) estimate the maximum amount of scorodite produced, assuming the transformation is complete.