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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. Ukwakira 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.
Hagati
A day

Amabwiriza

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.

Ibikoresho by'iyi ntambwe:

Aside ya boreAside ya bore200 g

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
Akabindi k'icyumaAkabindi k'icyuma
Itanura ry'amakaraItanura ry'amakara
AmakaraAmakara
PirometeroPirometero
Uruti rw'icyumaUruti rw'icyuma
Uturindantoki two gukomeza ibyumaUturindantoki two gukomeza ibyuma
Amadarubindi y'umutekanoAmadarubindi y'umutekano
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.

Ibikoresho bikenewe:

Itanura ry'amakaraItanura ry'amakara
PirometeroPirometero
Uruti rw'icyumaUruti rw'icyuma
Amakoro y'Icyombo GishongeshaAmakoro y'Icyombo Gishongesha
Uturindantoki two gukomeza ibyumaUturindantoki two gukomeza ibyuma
Amadarubindi y'umutekanoAmadarubindi y'umutekano
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).

Ibikoresho bikenewe:

Isekuru n'UmuhiniIsekuru n'Umuhini
Umunzani w'ibiroUmunzani w'ibiro
Icupa ry'IkirahureIcupa ry'Ikirahure
Agapfukamunwa k'UmukunguguAgapfukamunwa k'Umukungugu
4

Oxide from your acid

Gupakira ikaye ya Jupyter…

Ibikoresho

1

Ibikoresho bikenewe

12

Iki gishushanyo gikora

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Okiside ya boron

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