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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.
Menengah
Half a day
Instruksi
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.
Material untuk langkah ini:
Kalium karbonat (potas)1 kg
Air6 liter
Kalsium hidroksida (kapur padam)1 kgAlat yang dibutuhkan:
Neraca lengan
Ketel Besi
Kacamata Pelindung Cipratan Kimia
Pelindung Wajah
Sarung tangan karet2
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.
Material untuk langkah ini:
Arang1 as requiredAlat yang dibutuhkan:
Ketel Besi
Tungku ArangKacamata Pelindung Cipratan KimiaPelindung WajahSarung tangan karet3
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.
Material untuk langkah ini:
Arang1 as requiredAlat yang dibutuhkan:
Selang sifonKetel BesiTungku ArangKacamata Pelindung Cipratan KimiaPelindung WajahSarung tangan karet4
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.
Alat yang dibutuhkan:
Pelat besi
Botol kaca bersumbatKacamata Pelindung Cipratan KimiaPelindung WajahSarung tangan karet5
5
How much caustic potash
How much caustic potash
Memuat notebook Jupyter…
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.
Bahan
4- Placeholder
- 6 literPlaceholder
- Placeholder
- 1 as requiredPlaceholder
Alat yang Diperlukan
9- Placeholder
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