How to get CaSO4?

1) Ca + H2SO4 -> CaSO4; 2) CaO + H2SO4 -> CaSO4 + H2O; 3) Ca (OH) 2 + H2SO4 -> CaSO4 + 2H2O; 4) in the reaction of salts containing a less active metal, for example: MgSO4 (any salt with an acidic sulfuric acid residue) + Ca (NO3) 2 (any salt with calcium) -> CaSO4 + Mg (NO3) 2 + CaSO4 ; 5) reaction with a salt containing a more active metal: Li2SO4 + Ca (OH) 2 -> 2LiOH + CaSO4. In all methods, there is a difference only in by-products.



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