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Caustic Potash (Potassium Hydroxide) from Potash and Slaked Lime, Ure 1839
Boiling potash with slaked lime makes it caustic: the lime takes the carbonic acid and falls as chalk, and potassium hydroxide stays in the water. Andrew Ure (1839) gives the method; it was the main way to make caustic potash until electrolysis took over late in the 19th century.
中级
Half a day
说明
1
1
Dissolve and add lime
Dissolve and add lime
Dissolve the potash in six times its weight of water in an iron kettle. Stir in as much slaked lime as there was potash.
此步骤所需材料：
碳酸钾（草木灰碱）1 公斤
水6 升
氢氧化钙（熟石灰）1 公斤所需工具：
天平
铁壶
化学防溅护目镜
面屏
橡胶手套2
2
Boil an hour, then settle
Boil an hour, then settle
Boil for an hour. Cover it and let the chalk settle, out of contact with air: the lye takes carbonic acid back from the air.
此步骤所需材料：
木炭1 as required所需工具：
铁壶
木炭炉化学防溅护目镜面屏橡胶手套3
3
Siphon off and boil down
Siphon off and boil down
Siphon the clear lye into the cleaned kettle and boil it down, covered except for a small steam hole, until it flows like oil, nearly red-hot.
此步骤所需材料：
木炭1 as required所需工具：
虹吸管铁壶木炭炉化学防溅护目镜面屏橡胶手套4
4
Pour, cut and bottle
Pour, cut and bottle
Pour it onto a bright iron plate, cut it into pieces as soon as it sets and bottle it at once under a ground stopper: in air it soaks up water and carbonic acid.
所需工具：
铁板
带塞玻璃瓶化学防溅护目镜面屏橡胶手套5
5
How much caustic potash
How much caustic potash
正在加载 Jupyter 笔记本…
6
6
Limits
Limits
Ure's method; the kettle, the charcoal fire and the quantities in the notebook are ours. Caustic potash burns skin and eyes: Ure says never to touch it with the fingers.
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