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Barium Peroxide: Barium Oxide Heated in Air
Barium oxide takes oxygen from the air at about 500 °C and becomes barium peroxide; above 820 °C it gives the oxygen back. The Brin process used this to separate oxygen from air, and the peroxide was once the source of hydrogen peroxide. It is an oxidiser and harmful if swallowed.
The picture: barium peroxide on a watch glass.
中级
A day
说明
1
1
Spread it thin
Spread it thin
Crush the barium oxide, weigh it, and spread it thin in an open iron crucible so the air can reach it.
此步骤所需材料：
氧化钡150 克所需工具：
研钵与研杵
等臂天平
铸铁坩埚
防尘口罩
橡胶手套2
2
Heat in air
Heat in air
Hold the open crucible at about 500 °C in the furnace, checked with the pyrometer, stirring now and then with an iron rod. Never let it go above 820 °C, or the oxygen leaves again.
所需工具：
木炭坩埚炉
木炭
高温计
铁棒
坩埚钳
电焊手套
化学防溅护目镜3
3
Weigh until done
Weigh until done
Lift it out each hour, let it cool a little and weigh it. When it stops gaining, it is peroxide (step 4). Keep it in a dry, closed jar away from anything that burns.
所需工具：
等臂天平坩埚钳
玻璃罐电焊手套4
4
Follow the weight
Follow the weight
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