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Vanadium Trioxide: the Pentoxide Reduced with Carbon at Red Heat (Thorpe, 1913)
Vanadium trioxide, a black powder, made by heating vanadium pentoxide with carbon to a red heat. It is the oxide Gin reduced with ferro-silicon to make ferro-vanadium.
Hot trioxide takes up oxygen quickly and turns back to the dioxide, so it is kept out of the air while hot.
Source: T. E. Thorpe, Dictionary of Applied Chemistry vol. V (1913), p. 610. Picture: the book's text.
中级
Unknown
说明
1
1
Mix pentoxide and carbon
Mix pentoxide and carbon
Grind vanadium pentoxide with carbon. Proportions are not given.
此步骤所需材料：
氧化钒1 个
碳1 个所需工具：
研钵与研杵2
2
Reduce at red heat
Reduce at red heat
Heat the mixture in a crucible to a red heat; the pentoxide is reduced to the trioxide, a black powder.
所需工具：
坩埚
马弗炉3
3
Cool out of air
Cool out of air
In air the trioxide oxidises slowly when cold and quickly when hot, forming the dioxide (Thorpe); so cool it with the crucible covered (our step).
所需工具：
坩埚
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