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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.
Kati
Half a day
Maagizo
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.
Vifaa kwa hatua hii:
Kabonati ya potasiamu (potashi)1 kg
Maji6 lita
Hidroksidi ya kalsiamu (chokaa iliyozimwa)1 kgZana zinazohitajika:
Mizani ya mizani-mbili
Birika la Chuma
Miwani ya kinga dhidi ya kemikali
Ngao ya Uso
Glavu za mpira2
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.
Vifaa kwa hatua hii:
Mkaa1 as requiredZana zinazohitajika:
Birika la Chuma
Tanuru la mkaaMiwani ya kinga dhidi ya kemikaliNgao ya UsoGlavu za mpira3
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.
Vifaa kwa hatua hii:
Mkaa1 as requiredZana zinazohitajika:
Mrija wa kuhamishia kimiminikaBirika la ChumaTanuru la mkaaMiwani ya kinga dhidi ya kemikaliNgao ya UsoGlavu za mpira4
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.
Zana zinazohitajika:
Bamba la chuma
Chupa za kioo zenye viziboMiwani ya kinga dhidi ya kemikaliNgao ya UsoGlavu za mpira5
5
How much caustic potash
How much caustic potash
Inapakia daftari la 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.
Vifaa
4- Kishikilia Nafasi
- 6 litaKishikilia Nafasi
- Kishikilia Nafasi
- 1 as requiredKishikilia Nafasi
Zana Zinazohitajika
9- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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