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�Q 40g ��, �� 400mL ��sˮ��, ��ɵV�{, Ȼ�� 6% �� NaF ��̈́�, �� 70 ��ˮԡ�Д��1. 5h,��a(ch��n)�｛(j��ng)�^�V, ��sˮϴ�� 2 ��, �V�ɺ�, 85 �º�ɡ��o�C(j��)��Ԅ��Ƃ�: �� 65 ˮԡ�l��, �� 0 4mol/ L ��N aOH ��Һ��μ��뵽 0. 4mol/ L FeCl3��Һ��, ��, ��ֹ�ֲ� OH-�^��,�� NaOH ��c FeCl3��Ȟ� 2 1�r(sh��), ֹͣ��,��^�m(x��)�� 2h

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