Ferric Oxide: Hydroxide Precipitated from Ferric Chloride with Ammonia, Then Heated

Ferric oxide, Fe2O3, made by way of the hydroxide as Thorpe's Dictionary (1912) gives it. Ferric chloride solution with excess ammonia throws down a bulky, brown, slimy hydroxide, which shrinks a great deal as it dries. Heated, it slowly gives up its water at 320 °C; taken to dull redness it suddenly contracts and glows, and is then much less soluble in acids. The picture: our diagram.

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说明

Precipitate with excess ammonia

Add excess ammonia to ferric chloride solution: the hydroxide comes down as a bulky, brown, slimy precipitate. No amounts are given. Ours: stir in a beaker in a fume hood.

此步骤所需材料：

氯化铁溶液1 as required

所需工具：

氨水 25-28 %

玻璃烧杯

搅拌器

通风柜（带排风管）

化学防溅护目镜

橡胶手套

Filter, wash and dry (ours)

Ours: filter off the precipitate, wash it with water and dry it; it shrinks a great deal as it dries.

所需工具：

滤纸

带颈玻璃漏斗

实验室洗瓶

蒸馏水

干燥炉

Heat to dull redness

Heat the dry hydroxide: it gives up its water slowly at 320 °C. Taken on to dull redness, the anhydrous oxide suddenly contracts and glows brightly. Ours: a porcelain crucible in a muffle furnace.

所需工具：