浓度均为2.0×10 -2 mol•L -1的Cd 2+、Hg 2+混合溶液，欲在 pH=6.0时，用0.02000 mol•L -1EDTA滴定其中的Cd 2+，试问：（1）用KI掩蔽混合溶液中的Hg 2+ ，使终点时碘离子的浓度[I -]=0.010mol•L -1能否完全掩蔽？lgK ’ cdY为多少？（2）已知二甲酚橙与Cd 2- 、Hg 2+都显色，在 pH=6.0时lgK ’ HG-XO=9.0，lgK ’ Cd-XO=5.5，能否用二甲酚橙作滴定Cd 2+的指示剂（即此时Hg 2+是否会与指示剂显色）？（3）若能以二甲酚橙作指示剂，终点误差为多少？ -题库考试答案搜索网

浓度均为2.0×10 -2 mol•L -1的Cd 2+、Hg 2+混合溶液，欲在 pH=6.0时，用0.02000 mol•L -1EDTA滴定其中的Cd 2+，试问：（1）用KI掩蔽混合溶液中的Hg 2+ ，使终点时碘离子的浓度[I -]=0.010mol•L -1能否完全掩蔽？lgK ’ cdY为多少？（2）已知二甲酚橙与Cd 2- 、Hg 2+都显色，在 pH=6.0时lgK ’ HG-XO=9.0，lgK ’ Cd-XO=5.5，能否用二甲酚橙作滴定Cd 2+的指示剂（即此时Hg 2+是否会与指示剂显色）？（3）若能以二甲酚橙作指示剂，终点误差为多少？

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2022-01-11 17:10

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