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【简答题】
（12分）某学校课外活动小组在实验室中制备Fe(OH) 3 胶体，其制备方法是： ①将蒸馏水加热煮沸； ②在沸水中滴加 。 ③煮沸至溶液刚好出现红褐色，停止加热。 回答下列问题： (1)在步骤②中滴加的试剂是： 。 (2)该反应的化学方程式为： 。 (3)甲同学想证明Fe(OH) 3 胶体已制成，他可以利用 。（最简单的方法） (4)想将Fe(OH) 3 胶体提纯，他可以采用的方法是 。 (5)写出Fe(OH) 3 胶体具备的两条性质（任写两条）： ①___________________________； ②___________________________。
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