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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.
Hagati
Half a day
Amabwiriza
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.
Ibikoresho by'iyi ntambwe:
Karubonate ya potasiyumu (potashi)1 kg
Amazi6 litiro
Hidorogiside ya kalisiyumu (ishwagara yazimye)1 kgIbikoresho bikenewe:
Umunzani w'ibiro
Ibirika ry'Icyuma
Amadarubindi yo Kwirinda Ibinyabutabire
Ingabo y'Isura
Uturindantoki tw'ikawusu2
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.
Ibikoresho by'iyi ntambwe:
Amakara1 as requiredIbikoresho bikenewe:
Ibirika ry'Icyuma
Itanura ry'amakaraAmadarubindi yo Kwirinda IbinyabutabireIngabo y'IsuraUturindantoki tw'ikawusu3
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.
Ibikoresho by'iyi ntambwe:
Amakara1 as requiredIbikoresho bikenewe:
Umuyoboro wo gusukuraIbirika ry'IcyumaItanura ry'amakaraAmadarubindi yo Kwirinda IbinyabutabireIngabo y'IsuraUturindantoki tw'ikawusu4
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.
Ibikoresho bikenewe:
Urupapuro rw'icyuma
Amacupa y'ikirahuri afite ibipfundikizoAmadarubindi yo Kwirinda IbinyabutabireIngabo y'IsuraUturindantoki tw'ikawusu5
5
How much caustic potash
How much caustic potash
Gupakira ikaye ya 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.
Ibikoresho
4- Umwanya
- 6 litiroUmwanya
- 1 as requiredUmwanya
Ibikoresho bikenewe
9- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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