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82问答网 > 鉴定未知溶液中是否有钾，钠，铝，锌，铅五种金属离子

鉴定未知溶液中是否有钾，钠，铝，锌，铅五种金属离子

2025-04-07 21:09:47

推荐回答（1个）

回答1：

Pb鉴定原理是PbCrO4能溶于稀碱溶液中，酸化后又析出黄色沉淀。用稀醋酸调到中性或弱酸性，滴加10%K2CrO4溶液几滴，产生黄色沉淀，证明有Pb2+存在
Zn2+和Al3+可以通过滴加氨水鉴别。氢氧化锌可以溶解于氨水中，氢氧化铝不行
K的鉴别可以通过加入高氯酸鉴别，这5种金属中只有高氯酸钾是沉淀

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