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【单选题】
已知配离子[Ag(EDTA] 3- 、[Fe(EDTA)] 2- 、[Cu(EDTA)] 2- 和[Zn(EDTA)] 2- 的稳定常数分别为2.1×10 7 、2.1×10 14 、5.0×10 18 、3.0×10 16 ,则以EDTA加到含Ag + 、Fe 2+ 、Cu 2+ 、Zn 2+ 的溶液中,则下列说法正确的是( )。A.
EDTA滴定分析Ag + ,溶液中含有中Fe 2+ 对分析影响不大
B.
EDTA滴定分析Cu 2+ ,溶液中存在少量Ag + 对分析影响较小
C.
EDTA滴定分析Cu 2+ ,溶液中含有中Zn 2+ 对分析影响较小
D.
EDTA滴定分析Fe 2+ ,溶液中存在少量Zn 2+ 对分析影响较小
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