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Caustic Potash (Potassium Hydroxide) from Potash and Slaked Lime, Ure 1839
Leiem (Wikimedia Commons) · CC BY-SA 4.0
Charlie

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Charlie

14. Oktober 2026DE
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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.
Pertengahan
Half a day

Arahan

1

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.

Bahan untuk langkah ini:

Kalium karbonat (potas)Kalium karbonat (potas)1 kg
AirAir6 liter
Kalsium hidroksida (kapur mati)Kalsium hidroksida (kapur mati)1 kg

Alatan diperlukan:

Neraca dua piringNeraca dua piring
Cerek BesiCerek Besi
Gogal Percikan KimiaGogal Percikan Kimia
Perisai MukaPerisai Muka
Sarung tangan getahSarung tangan getah
2

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.

Bahan untuk langkah ini:

ArangArang1 as required

Alatan diperlukan:

Cerek BesiCerek Besi
Relau ArangRelau Arang
Gogal Percikan KimiaGogal Percikan Kimia
Perisai MukaPerisai Muka
Sarung tangan getahSarung tangan getah
3

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.

Bahan untuk langkah ini:

ArangArang1 as required

Alatan diperlukan:

Tiub sifonTiub sifon
Cerek BesiCerek Besi
Relau ArangRelau Arang
Gogal Percikan KimiaGogal Percikan Kimia
Perisai MukaPerisai Muka
Sarung tangan getahSarung tangan getah
4

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.

Alatan diperlukan:

Plat besiPlat besi
Botol kaca bersumbatBotol kaca bersumbat
Gogal Percikan KimiaGogal Percikan Kimia
Perisai MukaPerisai Muka
Sarung tangan getahSarung tangan getah
5

How much caustic potash

Memuatkan buku nota Jupyter…
6

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

Alatan Diperlukan

9

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oleh CharlieDE

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