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【简答题】
在实验室中制备 Fe(OH) 2 ,并使 Fe(OH) 2 长时间保持白色沉淀状态。由于 Fe(OH) 2 易被氧化为 Fe(OH) 3 ,所以实验的关键是防止 Fe(OH) 2 被 _______ 。制备原理: Fe 2 + + 2OH - == Fe(OH) 2 ↓。 1 : FeSO 4 溶液与 NaOH 溶液反应制备 1配制 FeSO 4 溶液和 NaOH 溶液的蒸馏水要事先煮沸,除去 ______ ; 2在装有 FeSO 4 溶液的试管里加入苯 ( 或植物油 ) ,使其起到 _________ 的作用; 3吸有 NaOH 溶液的胶头滴管应 ______FeSO 4 溶液的液面下,再挤出 NaOH 溶液。 ( 见下图 ) 2 、氢气氛围 在下图所示的装置中,用 NaOH 溶液、铁屑、稀硫酸等试剂制备。 先打开止水夹, ____________________________ ,关闭止水夹,生成的 _________ 被 ______________________ 。 3 :电解法 利用电解实验可以制得纯净的 Fe(OH) 2 白色沉淀,如下图所示,两电极的材料分别为石墨和铁 ( 阳极 ) 。 请写出阳极发生的电极反应方程式_____________________。
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