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

Yenziwe ngu-

Charlie

14. uMfumfu 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.
Ophakathi
A day

Imiyalelo

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.

Izinto zokwakha zalesi sinyathelo:

I-boric acidI-boric acid200 g

Amathuluzi adingekayo:

Isikali sesilinganisoIsikali sesilinganiso
Ibhodwe lokuncibilikisa lensimbiIbhodwe lokuncibilikisa lensimbi
Isithando SamalahleIsithando Samalahle
AmalahleAmalahle
I-pyrometerI-pyrometer
Induku yensimbi eyindilingaInduku yensimbi eyindilinga
Amagilavu okushiselaAmagilavu okushisela
Izibuko zokuphephaIzibuko zokuphepha
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.

Amathuluzi adingekayo:

Isithando SamalahleIsithando Samalahle
I-pyrometerI-pyrometer
Induku yensimbi eyindilingaInduku yensimbi eyindilinga
Udlawu Lwesitsha SokuncibilikisaUdlawu Lwesitsha Sokuncibilikisa
Amagilavu okushiselaAmagilavu okushisela
Izibuko zokuphephaIzibuko zokuphepha
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).

Amathuluzi adingekayo:

Isigqulo NomgquloIsigqulo Nomgqulo
Isikali sesilinganisoIsikali sesilinganiso
Ijeke LengilaziIjeke Lengilazi
Imaski YothuliImaski Yothuli
4

Oxide from your acid

Ilayisha incwadi ye-Jupyter…

Izinto

1

Amathuluzi Adingekayo

12

Le blueprint yenza

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I-boric oxide

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Venetian Borax: Refining Tincal with Lime

Venetian Borax: Refining Tincal with Lime

ngu-CharlieDE

Inorganic

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