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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.
Àárín
Half a day
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Potassiọ̀mù kaboneti (potash)1 kg
Omi6 lítà
Calcium hydroxide (ẹfun tí a pa)1 kgÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Kẹ́tù Irin
Gílásì Ààbò Fún Ìfọ́n Kẹ́míkà
Ààbò Ojú Gbogbo
Ìbọ̀wọ́ rọ́bà2
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Èédú1 as requiredÀwọn irinṣẹ́ tí a nílò:
Kẹ́tù Irin
Ààrò ÈédúGílásì Ààbò Fún Ìfọ́n Kẹ́míkàÀàbò Ojú GbogboÌbọ̀wọ́ rọ́bà3
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Èédú1 as requiredÀwọn irinṣẹ́ tí a nílò:
Tọ́ọ̀bù ìfàjádeKẹ́tù IrinÀàrò ÈédúGílásì Ààbò Fún Ìfọ́n Kẹ́míkàÀàbò Ojú GbogboÌbọ̀wọ́ rọ́bà4
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.
Àwọn irinṣẹ́ tí a nílò:
Pẹpẹ irin
Àwọn ìgò dígí pẹ̀lú ìdéríGílásì Ààbò Fún Ìfọ́n Kẹ́míkàÀàbò Ojú GbogboÌbọ̀wọ́ rọ́bà5
5
How much caustic potash
How much caustic potash
Ń ṣí ìwé 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.
Àwọn ohun-èlò
4- 6 lítàÀyè
- 1 as requiredÀyè
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