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Antimony Trioxide: Roasted Antimony Fused with More Metal (Thorpe 1912)
Antimony trioxide is a white, fusible powder that turns to vapour at red heat. Powdered antimony heated in a shallow dish becomes antimony tetroxide. Fused with more metal, the tetroxide gives the trioxide, and the spare metal sinks.
Source: Thorpe, Dictionary of Applied Chemistry vol. 1 (1912), Antimony. Not given: amounts, heats or times. The furnace and crucible are ours. Work under a hood with a respirator, because the oxide fumes at red heat. Picture drawn by Youblob.
Intermediate
1 day
Instructions
1
1
Powder the antimony and roast it
Powder the antimony and roast it
Powder antimony and heat it in a shallow dish until it has turned into antimony tetroxide. Keep back some unroasted metal. Not given: heat and time. Work under a hood.
Materials for this step:
Antimony1 as requiredTools needed:
Mortar and Pestle
Shallow Dish
Muffle Furnace
Fume Hood (Ducted)
P100 Respirator
Heat-Resistant Gloves2
2
Fuse with unchanged metal
Fuse with unchanged metal
Fuse the tetroxide with unchanged antimony in a crucible. They react to antimony trioxide, and the spare metal sinks to the bottom. Ours: a lidded crucible, kept below red heat as far as you can, since the trioxide is volatile at red heat. Heated longer in air it goes back to the tetroxide.
Materials for this step:
Antimony1 as requiredTools needed:
Clay Crucible - RefractoryMuffle Furnace
Crucible TongsFume Hood (Ducted)P100 RespiratorHeat-Resistant Gloves3
3
Break out and store the oxide
Break out and store the oxide
Ours: let it cool, break the white oxide away from the metal button, powder it and keep it in a closed, labelled jar.
Tools needed:
Mortar and PestleP100 Respirator
Dark Glass Jars with Airtight LidsTools Required
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