【单选题】【消耗次数：1】
有关EDTA的酸效应,下列叙述正确的是
①
酸效应系数越小,配合物的稳定性越小
②
pH值越小,酸效应系数越大
③
酸效应系数越大,配位滴定曲线的PM突跃范围越大
④
酸效应曲线表示的是各金属离子能够准确滴定的最高PH值
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