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twardnieje pod wpływem wody:
2(CaSO₄ x 2H₂O)->2CaSO₄ x 2H₂O +3H₂O
zaprawa wapienna:
CaO+H₂O->Ca(OH)₂
(CaSO₄)₂*H₂O+3H₂O-> 2(CaSO₄*2H₂O)