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Epsom Salt: Magnesian Limestone Digested in Dilute Sulphuric Acid, Ure 1839
Epsom salt, sulphate of magnesia, was first got from the springs at Epsom in 1695. Andrew Ure (1839): the simple way is to digest magnesian limestone in dilute sulphuric acid; the lime falls out as sulphate of lime and the clear liquid is boiled down to crystals. Gloves and goggles for the acid.
The picture: Epsom salt crystals.
初学者
Three days
说明
1
1
Grind
Grind
Break and grind the magnesian limestone to a coarse powder and weigh it.
此步骤所需材料：
白云石（镁质石灰岩）1 公斤所需工具：
研钵与研杵
细目筛
等臂天平
防尘口罩2
2
Digest in acid
Digest in acid
In a wooden tub, stir the powder into dilute sulphuric acid a little at a time. Add acid until fresh acid no longer fizzes on the stone (ours), and leave it to stand.
此步骤所需材料：
稀硫酸4 升所需工具：
箍木盆
玻璃搅拌棒
化学防溅护目镜
橡胶手套3
3
Settle and pour off
Settle and pour off
Let the white sulphate of lime settle to the bottom, then pour the clear liquid off it.
所需工具：
箍木盆
大汤锅化学防溅护目镜橡胶手套4
4
Crystallise
Crystallise
Boil the clear liquid down (step 5) and leave it to cool: the salt forms in four-sided prisms. Drain, dry and keep it in a closed jar.
所需工具：
大汤锅
薪柴
蒸发皿
玻璃罐化学防溅护目镜橡胶手套5
5
Water for crystallising
Water for crystallising
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