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116问答网 > 向明矾溶液中滴加氢氧化钡，使铝离子全部沉淀

向明矾溶液中滴加氢氧化钡，使铝离子全部沉淀

向明矾溶液中滴加氢氧化钡，使铝离子全部沉淀的离子方程式

2025-03-16 07:12:59

推荐回答（1个）

回答1：

明矾KAl(SO4)2和氢氧化钡Ba(OH)2反应时，1mol明矾和2mol氢氧化钡反应，SO42-才能完全沉淀。
2molBa(OH)2含有4molOH－离子，1molKAl(SO4)2含有1molAl3+，与4molOH-离子正好完全反应生成AlO2-：Al3+ + 4OH- —— AlO2- + 2H2O
总的离子方程式为：

Al3+ + 2SO42- + 2Ba2+ + 4OH- —— AlO2- + 2BaSO4↓ +2H2O

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