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CN -+ClO-+H2O=CNCl+2OH -(һ)CNCl+2OH-=CNO-+Cl-+H2O (��)

��һ��(y��ng)�^��У�(һ)ʽ��(y��ng)�ܿ�,��(��)ʽ��(y��ng)��PHֵС��8.5�r,��(y��ng)�ٶ��ጷų��CNCl��Σ�U,��ڵ�һ��(y��ng)�^��ˮ��PHֵҪ��Ƶ�≥11,��

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2NaCNO+3HOCl=2CO2+N2+2NaCl+HCl+H2O

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2CrO42-+2H+Cr2O72-+H2O

Cr2O72-+2OH-CrO42-+H2O

��ʽ��Կ��ԗl��£��r�t��Ҫ�� Cr2O72-��ʽ��,��ډA�ԗl��t��CrO42-��ʽ��,��僺��t�Uˮ��Ưϴ�Uˮһ��PH��5��,��(sh��)��CrO42-��,��߀ԭ�rͨ��PH��ѿ��2.5~3֮�g��䷴��(y��ng)ԭ��(߀ԭ�� Na2SO3��)�飺

2H2CrO4+3 Na2SO3+3H2SO4=Cr(SO4)3+3Na2SO4+5H2O

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