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硫化钠和重铬酸钾反应加硝酸铅

硫化钠和重铬酸钾反应加硝酸铅

2025-03-15 01:01:30

推荐回答（1个）

回答1：

生成铬酸铅沉淀.因为Cr2O72-在强酸性溶液中主要以Cr2O72-存在,在强碱性中为CrO42-离子,在中性溶液中则两种离子大致各占一半.原因是存在以下平衡：2CrO42-+2H+==H2O+CR2O72-.2Pb(NO3)2+K2Cr2O7+H2O=2PbCrO4（沉淀）+2KNO3+2HNO3

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