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除去氯化铵中的氯化铁加氨水为什么要调节ph到7-8？

2025-03-26 22:01:44

推荐回答（2个）

回答1：

氨水显碱性，但是氯化铵显酸性，氯化铁更是显酸性，因为三价铁在ph大于4,4时就水解完全了；氨水加少了不一定能使三价铁完全生成沉淀，故要调节ph到7-8
7-8是一个范围，ph值的范围

回答2：

产生氢氧化铁沉淀，氯化铵是弱酸性，加氨水抑制水解，
这里的7-8，就是表明一个弱碱环境

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