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Argon: Air Led over Calcium Carbide and Calcium Chloride at 800 °C (Fischer and Ringe, Thorpe 1912)
Air is nearly 1 % argon. Red-hot calcium carbide with a little calcium chloride swallows both the oxygen and the nitrogen; argon, which combines with nothing, passes straight through.
Result: about 11 litres of argon from 7 kg of carbide in two days. It still holds traces of neon, krypton and xenon (0.25 %, mostly neon).
Source: Thorpe, Dictionary of Applied Chemistry vol. 1 (1912), p. 291, after Fischer and Ringe (Ber. 41, 2017). Not given: the vessel, the air volume, and how the water and carbon dioxide are taken out. Picture drawn by Youblob.
Hejuru
2 days
Amabwiriza
1
1
Mix the absorbent
Mix the absorbent
Mix calcium carbide (90 %) with calcium chloride (10 %): 7 kg carbide takes about 0.78 kg chloride (our arithmetic). Fill a tube with it. Ours: a porcelain tube in a tube furnace.
Ibikoresho bikenewe:
Karubide ya kalisiyumu
Kloridi ya kalisiyumu
Umuyoboro wa Porcelaine
Itanura ry'umuyoboro2
2
Drive off volatile matter
Drive off volatile matter
Heat the mixture under reduced pressure first, to drive off anything volatile.
Ibikoresho bikenewe:
Pompe ikuramo umwukaItanura ry'umuyoboro3
3
Lead air over it at 800 °C
Lead air over it at 800 °C
Hold the mixture at 800 °C and lead air over it slowly. The oxygen and nitrogen are taken up; what comes out is mostly argon. Ours: draw the air through with an aspirator.
Ibikoresho by'iyi ntambwe:
Umwuka wo mu kirere - Isi1 as requiredIbikoresho bikenewe:
Pirometero
AsipirateriItanura ry'umuyoboro4
4
Burn the traces over hot copper oxide
Burn the traces over hot copper oxide
Lead the gas over hot copper oxide. It burns any hydrogen, hydrocarbons and carbon monoxide.
Ibikoresho bikenewe:
Okiside y'umuringaUmuyoboro wa PorcelaineItanura ry'umuyoboro5
5
Take out water and carbon dioxide
Take out water and carbon dioxide
Remove the water vapour and carbon dioxide. Ours: soda lime for the carbon dioxide, then phosphorus pentoxide for the water.
Ibikoresho bikenewe:
Ishwagara ya soda (inyunyuza CO2)
Fosifore Pentokiside
Icupa ryogesha gaze6
6
Collect the argon
Collect the argon
Collect the gas. Expect about 11 litres in two days from 7 kg of carbide. Ours: over water in gas jars.
Ibikoresho bikenewe:
Ikibaya cy'umwuka gifite ibibindi by'imyukaIbikoresho
1- 1 as requiredUmwanya
Ibikoresho bikenewe
12- Umwanya
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