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若配制 EDTA 溶液的水中含 Ca 2+ ,判断下列情况对测定结果的影响: (1) 以 CaCO 3 为基准物质标定 EDTA 标准溶液,并用该标准溶液滴定试液中的 Zn 2+ ,以二甲酚橙为指示剂; (2) 以为基准物质,二甲酚橙为指示剂标定 EDTA 标准溶液,并用该标准溶液滴定试液中的 Ca 2+ 、 Mg 2+ 合量; (3) 以 CaCO 3 为基准物质,铬黑 T 为指示剂标定 EDTA 标准溶液,并用该标准溶液滴定试液中 Ca 2+ 、 Mg 2+ 合量。 并以此例说明络合滴定中为什么标定和测定的条件要尽可能一致。 保存
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