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Zinc Oxide (Pharmacy): Zinc Carbonate Precipitated with Hot Soda, Then Heated
The zinc oxide of pharmacy, by the wet route Thorpe's Dictionary (1913) gives: very pure zinc sulphate is precipitated with a hot solution of sodium carbonate, and the dried zinc carbonate is heated to drive off the carbon dioxide. Pure zinc oxide dissolves completely in ammonia.
The picture: our diagram.
初学者
1 day
说明
1
1
Precipitate with hot sodium carbonate
Precipitate with hot sodium carbonate
Precipitate a solution of very pure zinc sulphate with a hot solution of sodium carbonate. No amounts are given. Ours: dissolve each in water and stir the hot carbonate solution in.
此步骤所需材料：
硫酸锌1 as required所需工具：
碳酸钠（纯碱）
蒸馏水
玻璃烧杯
搅拌器
电热板
橡胶手套2
2
Filter, wash and dry (ours)
Filter, wash and dry (ours)
Ours: filter off the carbonate, wash it with water and dry it.
所需工具：
滤纸
带颈玻璃漏斗
实验室洗瓶
干燥炉3
3
Heat to expel carbon dioxide
Heat to expel carbon dioxide
Heat the dried carbonate to drive off the carbon dioxide, leaving zinc oxide. No temperature is given. Ours: a crucible in a muffle furnace.
所需工具：
带盖坩埚（瓷质）
马弗炉
坩埚钳
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