sulfuric acid; water; sodium sulfate in water byproducts: H2O, CaSO3; reaction of a soln. of CaSO3 containing Na2SO4 and H2SO4 forming NaHSO3, Na2SO4, CaSO4; reaction of NaHSO3 with Na2SO4 and Ca(OH)2 forming Na2SO3, CaSO3, Na2SO4, H2O; reaction of Na2SO3 with CaSO3, Na2SO4, H2O, Ca(OH)2 forming NaOH, CaSO3, Na2SO4, H2O;; filtration and reprocessing of CaSO3; precipitation of Na2SO4 by evaporation; reprocessing NaOH;;

in neat (no solvent) calcinated at 950°C with equimolar amounts of SiO2; ratio CaSO3:SiO2 = 1:2 gives best yields for CaSO4;;

oxygen in water oxidation by oxygen dissolved in water;;

hydrogen in neat (no solvent) electrical explosions;;