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Boric Oxide: Boric Acid Heated Slowly Past 300 °C
Materialscientist (talk) (Wikimedia Commons) · CC BY-SA 3.0
Charlie

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Charlie

14. Oktoba 2026DE
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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.
Kati
A day

Maagizo

1

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.

Vifaa kwa hatua hii:

Asidi ya boroniAsidi ya boroni200 g

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Kalibu ya chumaKalibu ya chuma
Tanuru la mkaaTanuru la mkaa
MkaaMkaa
Kipima joto kaliKipima joto kali
Fimbo ya chumaFimbo ya chuma
Glavu za kulehemuGlavu za kulehemu
Miwani ya usalamaMiwani ya usalama
2

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.

Zana zinazohitajika:

Tanuru la mkaaTanuru la mkaa
Kipima joto kaliKipima joto kali
Fimbo ya chumaFimbo ya chuma
Koleo la kaure ya kuyeyushiaKoleo la kaure ya kuyeyushia
Glavu za kulehemuGlavu za kulehemu
Miwani ya usalamaMiwani ya usalama
3

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).

Zana zinazohitajika:

Kinu na mchiKinu na mchi
Mizani ya mizani-mbiliMizani ya mizani-mbili
Chupa ya KiooChupa ya Kioo
Barakoa ya vumbiBarakoa ya vumbi
4

Oxide from your acid

Inapakia daftari la Jupyter…

Vifaa

1

Zana Zinazohitajika

12

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Venetian Borax: Refining Tincal with Lime

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