1) 1000 kg of mixed acid of composition 40% H2SO4, 45% HNO3 and 15% H2O is to be produced by strengthening waste acid of composition 30% H2SO4, 36% HNO3 and 34% H2O (by weight). The strengthening can be achieved by adding concentrated sulphuric acid (95%) and concentrated nitric acid (80%). How many kilograms of spent acid (70.22 kg) and concentrated acids (398.88 kg H2SO4, 530.90 kg HNO3) are to be mixed together? Basis: Unknowns: Egns.: S.R.: Maxing operation DOF