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58问答库 > 化学实验答案1.碘量法测定铜含量时，为什么常加入

化学实验答案1.碘量法测定铜含量时，为什么常加入

2025-04-07 06:28:30

推荐回答（1个）

回答（1）：

你说的是NH4SCN溶液吧，因CuI沉淀表面吸附I2,这部分I2不能被滴定,会造成结果偏低.加入NH4SCN溶液,使CuI转化为溶解度更小的CuSCN,而CuSCN不吸附I2,从而使被吸附的那部分I2释放出来,提高了测定的准确度.但为了防止I2对SCN-的氧化,NH4SCN应在临近终点时加入.

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