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（14分）．以富含硫酸亚铁的工业废液为原料生产氧化铁的工艺如下(部分操作和条件略)： Ⅰ.从废液中提纯并结晶出FeSO 4 ·7 H 2 O。 Ⅱ.将FeSO 4 ·7H 2 O配制成溶液。 Ⅲ.FeSO 4 溶液与稍过量的NH 4 HCO 3 溶液混合，得到含FeCO 3 的浊液。 Ⅳ.将浊液过滤，用90 ℃热水洗涤沉淀，干燥后得到FeCO 3 固体。 Ⅴ.煅烧FeCO 3 ，得到Fe 2 O 3 固体。 已知：NH 4 HCO 3 在热水中分解。 (1)Ⅰ中，加足量的铁屑除去废液中的Fe 3 ＋ ，该反应的离子方程式是_________________。 (2)Ⅱ中，需加一定量酸，该酸最好是 。运用化学平衡原理简述该酸的作用________________________________________________________________________。 (3)Ⅲ中，生成FeCO 3 的离子方程式是___________________________________________ 若FeCO 3 浊液长时间暴露在空气中，会有部分固体表面变为红褐色，该变化的化学方程式是_______________________________________。 (4)Ⅳ中，通过检验SO来判断沉淀是否洗涤干净，检验SO的操作是__________ ________________________________________________________________________。 (5)已知煅烧FeCO 3 的化学方程式是4FeCO 3 ＋O 2 2Fe 2 O 3 ＋4CO 2 。现煅烧464.0 kg的FeCO 3 ，得到316.8 kg产品。若产品中杂质只有FeO，则该产品中Fe 2 O 3 的质量是________kg。(摩尔质量/g·mol － 1 ：FeCO 3 116 Fe 2 O 3 160 FeO 72)
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