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        1)�ӉA̎��,��

        ��м��뼃�ANa2CO3��ˎ��,��ˮ��^ʣCO32-,��x��cCa2+��Mg2+�x��,��(y��ng)��£�

        Ca2++CO32-----CaCO3
        CO32-+H2O----2OH-+CO2
        Mg2++2OH-----Mg(OH)2

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        Na2CO3+H20----2NaOH+CO2

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        CaSO4+Na3PO4----Ca3(PO4)2+Na2SO4
        CaCl2+ Na3PO4----Ca3(PO4)2+NaCl
        MgSO4+Na3PO4----Mg3(PO4)2+Na2SO4
        MgCl2+ Na3PO4----Mg3(PO4)2+NaCl

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