偃�(n��i)ˮ̎��

��r�g��2008-10-28 16:02 ��Դ�� : ��x��2433

        偠t�oˮ�ڠt��M��ܛ��̎��,��Ч��ֹ偠t�ܟ��ϵĽY(ji��)��,��Ҫ�^��O(sh��)��Ͷ�Y��ˆT�;S�o�M��,��@��ĳЩС��偠t��Ǳ��^�y��F(xi��n)��,��˕r��偃�(n��i)ˮ̎��偃�(n��i)ˮ̎��ͨ�^��偠t�oˮͶ��һ��(sh��)��ˎ��,��c�γ�ˮ��}��𻯌W��,��ɢ��๸��Ȼ��ͨ�^��ی��๸��偃�(n��i)�ų�,��_��p��ֹˮ��Y(ji��)��Ŀ��,��

        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

        ��(y��ng)��ɵ�CaCO3��Mg(OH)2��B(t��i),��S��۳�ȥ,��

        2)��}̎��

        ��t��(n��i)��^�ߕr,��A��l(f��)��ˮ��,��䷴��(y��ng)��£�

        Na2CO3+H20----2NaOH+CO2

        ��ˠtˮ�в��ܱ��ֱ�Ҫ��CO32-��ȣ��Үa(ch��n)��˿��c,��ʹ�tˮ�A��^��,��偠t��@�rͨ��c��偃�(n��i)ˮ̎��̎��ˎ��,��tˮ�е��}�V�x��c��x�ӽY(ji��)��ܽ��С��}�V��}�,��(y��ng)ʽ��£�

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

        Ca3��PO4��2��Mg3��PO4��2��,��Ǿ��и߶ȷ�ɢ��z�w�w��ˮ��a��ĽY(ji��)��,��ʹCaCO3��Mg(OH)2,��܇��,��׃�ļ�С��ɢ,��ڽ��ٱ��渽��,��^��๸��S��۳�ȥ,��

        3)��븯ֲ��c,��

        ��븯ֲ��c��У��ֲ��c�ډA�ԗl��£��Ȼ��u��ϵ��c�x��,��cˮ�е��},��V�x��M�н��Q��ɸ�ֲ��},��V�ĳ��ʹˮ�|(zh��)�õ�ܛ��,��ֲ��c�z���}��V�}�ķ�ɢ,��,��j(lu��)�ϵ��õĽY(ji��)��ֹ�˾��w��L,��๸ճ��С,��S��ų�,��ֲ��c�ډA�ԗl��,��c偠t��һ�Ӻ�ɫ�ı��oĤ��ҽY(ji��)��(g��u)�o��,��w��,��һ�N��õľ��g��oĤ,��ֲ��c��^��ĝB͸��,��ܝB͸��ˮ��ͽ��ٽ��|��ϣ��c�},��V�}�l(f��)��(f��)�ֽ��,��ʹ��ˮ��c��ٱ��ĸ��Ͷ�Ó�䡣