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Barium: Barium Oxide Heated with Aluminium at 1200 °C in Vacuum (Guntz, Thorpe 1912)
Aluminium pulls the oxygen from barium oxide at 1200 °C. In a vacuum the freed barium boils off and condenses as metal in the cool end of the tube.
Result: silver-white barium, up to 98.8 % pure. It burns easily in air; Thorpe keeps barium in dry carbon dioxide.
Source: Thorpe, Dictionary of Applied Chemistry vol. 1 (1912), p. 418, after Guntz. Not given: the tube, amounts and time. Picture drawn by Youblob.
Ilọsíwájú
1 day
Ìlànà
1
1
Mix oxide with one-tenth aluminium
Mix oxide with one-tenth aluminium
Weigh barium oxide and mix it with one-tenth of its weight of aluminium. Ours: aluminium powder.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Barium oxide1 as requiredÀwọn irinṣẹ́ tí a nílò:
Èérú Álúmínọ́ọ̀mù
Òṣùwọ̀n Díjítà Pípé
Odó àti Ọmọ Odó Òkúta2
2
Heat to 1200 °C in vacuum
Heat to 1200 °C in vacuum
Heat the mixture to 1200 °C in an evacuated tube. Ours: a porcelain tube in a tube furnace on a vacuum pump. Barium vapour attacks glass; in his other method Guntz lines the tube with nickel foil.
Àwọn irinṣẹ́ tí a nílò:
Páìpù Páṣẹ́lẹ́ìnì
Ààrò Ọ̀pọ́n
Pirómítà
Ẹ̀rọ ìfàfẹ́fẹ́jáde3
3
Collect the metal from the cool end
Collect the metal from the cool end
The barium condenses in the cooler part of the tube. Take it out and keep it in dry carbon dioxide; it oxidises fast in air.
Àwọn irinṣẹ́ tí a nílò:
Páìpù Páṣẹ́lẹ́ìnìÀwọn ohun-èlò
1- 1 as requiredÀyè
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