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CaSO4-2H2O=煆燒=CaO+SO2+2H2O,會
若該溶液為堿溶液,則由水電離出的OH-濃度等於水中H+濃度,即為10^-12mol/L;若該溶液為強鹼弱酸鹽溶液,則溶液中OH-全部是由水電離形成的,濃度就為10^-2mol/L
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