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White Vitriol: Zinc Sulfate from Zinc and Dilute Acid, Ure 1839
Zinc sulfate, white vitriol, is made most readily by dissolving zinc in dilute sulfuric acid, then evaporating and crystallising the solution (Ure, 1839). It was used in drying oils for varnish and in calico printers' resist pastes. Hydrogen comes off while the zinc dissolves: keep flames away.
The picture: our diagram, zinc dissolving in acid and the crystals in the dish.
中级
Two days
说明
1
1
Granulate the zinc
Granulate the zinc
Melt the zinc in a crucible and pour it in a thin stream into a bucket of water so it sets as small grains, which dissolve faster.
此步骤所需材料：
锌锭50 克所需工具：
耐火黏土坩埚
铁匠炉
坩埚钳
水桶
化学防溅护目镜
橡胶手套2
2
Dissolve
Dissolve
Put the grains in a beaker and add dilute sulfuric acid a little at a time, outdoors and away from flames, until the fizzing stops with a little zinc still left.
此步骤所需材料：
稀硫酸0.8 升所需工具：
硼硅玻璃烧杯
玻璃搅拌棒
等臂天平化学防溅护目镜橡胶手套3
3
Filter
Filter
Pour the clear solution off the leftover zinc and filter it.
所需工具：
带颈玻璃漏斗
滤纸硼硅玻璃烧杯化学防溅护目镜橡胶手套4
4
Evaporate and crystallise
Evaporate and crystallise
Evaporate it in a dish on the sand bath until a skin forms, then let it cool slowly. Drain the crystals, dry them on filter paper and keep them in a closed jar.
所需工具：
蒸发皿
砂浴滤纸
玻璃罐化学防溅护目镜橡胶手套5
5
Yield
Yield
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