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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.
Katamtaman
Half a day
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Potassium carbonate (potas)1 kg
Tubig6 litro
Calcium hydroxide (apog na pinatay)1 kgMga kailangang kasangkapan:
Timbangang panimbang
Takure na Bakal
Salamin Laban sa Tilamsik ng Kemikal
Panangga sa Mukha
Gwantes na goma2
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.
Mga materyales para sa hakbang na ito:
Uling1 as requiredMga kailangang kasangkapan:
Takure na Bakal
Pugon na Uling
Salamin Laban sa Tilamsik ng Kemikal
Panangga sa Mukha
Gwantes na goma3
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.
Mga materyales para sa hakbang na ito:
Uling1 as requiredMga kailangang kasangkapan:
Tubong pansipon
Takure na Bakal
Pugon na Uling
Salamin Laban sa Tilamsik ng Kemikal
Panangga sa Mukha
Gwantes na goma4
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.
Mga kailangang kasangkapan:
Plato na bakal
Mga boteng salamin na may tapon
Salamin Laban sa Tilamsik ng Kemikal
Panangga sa Mukha
Gwantes na goma5
5
How much caustic potash
How much caustic potash
Naglo-load ng Jupyter notebook…
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.
Mga Materyales
4- Placeholder
- 6 litroPlaceholder
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- 1 as requiredPlaceholder
Mga Kinakailangang Kasangkapan
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