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Boric Oxide: Boric Acid Heated Slowly Past 300 °C
Boric oxide, a main part of borosilicate glass, is boric acid with its water driven off. Heated, boric acid gives off steam at about 170 °C and turns to metaboric acid; above 300 °C it loses the rest and leaves a clear glassy oxide. Heat it slowly, or it froths and gums.
The picture: boron trioxide in a vial.
中级
A day
说明
1
1
First heat
First heat
Weigh the boric acid into an iron crucible and warm it gently to about 170 °C, checked with the pyrometer, stirring, while it gives off steam.
此步骤所需材料：
硼酸200 克所需工具：
等臂天平
铸铁坩埚
木炭坩埚炉
木炭
高温计
铁棒
电焊手套
安全眼镜2
2
Over 300 °C
Over 300 °C
Raise the heat slowly above 300 °C. More steam comes off; go slowly so it does not froth up and gum. Hold it until no more steam rises and it settles to a clear glass.
所需工具：
木炭坩埚炉高温计铁棒
坩埚钳电焊手套安全眼镜3
3
Crush and store
Crush and store
Let it cool, break the glassy cake out, crush it to powder, weigh it and keep it in a closed jar (ours).
所需工具：
研钵与研杵等臂天平
玻璃罐
防尘口罩4
4
Oxide from your acid
Oxide from your acid
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