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如何测定硝酸钾的纯度

2025-02-11 19:29:54

推荐回答（1个）

回答1：

四苯硼酸钾容量法：在弱碱性条件下，以四苯硼酸钠溶液为沉淀剂沉淀样品试液中的钾离子，生成白色四苯硼酸钾沉淀，对沉淀过滤洗涤干净后加入一定过量的强酸标准溶液溶解沉淀，然后以酚酞为指示剂，用强碱标准溶液返滴定过量的酸，根据酸碱标准溶液消耗的体积及浓度，计算样品中的钾含量。相关反应式如下：K+ + Na[B(C6H5)4] → Na+ + K[B(C6H5)4]↓K[B(C6H5)4] + H+ → B(C6H5)3 + K+ + C5H6

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