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ÀWỌN OHUN WÍWỌ̀
Alumina: Alum Precipitated with Water of Ammonia and Calcined, Ure 1839
Alum is the earth of clay, alumina, joined to sulphuric acid and potash. Andrew Ure (1839): drop a weak alum solution into water of ammonia and a bulky white earth falls; washed, it is pure alumina hydrate. Calcined hot, it gives up its water and leaves alumina. Strong ammonia stings the eyes and lungs: work in the open with goggles.
The picture: aluminium oxide on a watch glass.
Àárín
Three days
Ìlànà
1
1
Dissolve the alum
Dissolve the alum
Dissolve the alum in twenty times its weight of water (step 5).
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ọ̀ṣẹ Alumu (Alumu Potáṣíọ̀mù)500 gÀwọn irinṣẹ́ tí a nílò:
Omi Àyọ́
Òǹwọ̀n ìdọ́gba
Ìkòkò Ńlá
Ọ̀pá Ìrúwé Gílásì2
2
Precipitate
Precipitate
Outdoors, drop the alum solution slowly into water of ammonia, stirring, until the ammonia is nearly but not quite used up (red litmus barely turns blue). A bulky white earth falls.
Àwọn irinṣẹ́ tí a nílò:
Omi amonia - 25-28 %
Ago BórósílíkéètìỌ̀pá Ìrúwé Gílásì
Bébà litmus
Gílásì Ààbò Fún Ìfọ́n Kẹ́míkà
Ìbọ̀wọ́ rọ́bà3
3
Wash and dry
Wash and dry
Let it settle, pour off the liquid, and wash the earth several times with clean water on a cloth. Dry it.
Àwọn irinṣẹ́ tí a nílò:
Aṣọ (fún Sísẹ́)Omi Àyọ́Ìkòkò ŃláGílásì Ààbò Fún Ìfọ́n Kẹ́míkàÌbọ̀wọ́ rọ́bà4
4
Calcine
Calcine
Pack the dry earth in a fireclay crucible and heat it in the furnace to about 1000 °C, checked with the pyrometer, for some hours. Cool, grind and keep the white alumina in a closed jar.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò Amọ̀ Tí Ń Kojú Iná
Ààrò Èédú
Èédú
Pirómítà
Ẹmú Ìkòkò Ìyọ́
Ìbọ̀wọ́ wẹ́lídìn
Odó àti Ọmọ Odó
Ìgò Gílásì5
5
Earth from your alum
Earth from your alum
Ń ṣí ìwé Jupyter…
Àwọn ohun-èlò
1- Àyè
Àwọn irinṣẹ́ tó nílò
18- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
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