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Water Glass: Ground Flints Boiled in Caustic Soda Lye, Ure 1839
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Water Glass: Ground Flints Boiled in Caustic Soda Lye, Ure 1839

Water glass is silica dissolved in caustic soda: a thick, syrupy liquid that sets to silica gel when acidified. Andrew Ure (1839): boil ground flints in strong caustic lye until the liquor is nearly twice as heavy as water. Hot caustic lye burns skin and eyes: goggles and gloves. The picture: our diagram of the boil and the hydrometer check.
Hagati
Two days

Amabwiriza

1

Grind the flints

Break flint nodules small with a sledge, grind them to a powder and sift it (ours).

Ibikoresho by'iyi ntambwe:

Ibuye ry'Amabuye AmurikaIbuye ry'Amabuye Amurika1 kg

Ibikoresho bikenewe:

Inyundo niniInyundo nini
Isekuru n'UmuhiniIsekuru n'Umuhini
Akayunguruzo Gafite Urukoma RutoAkayunguruzo Gafite Urukoma Ruto
Umunzani w'ibiroUmunzani w'ibiro
Agapfukamunwa k'UmukunguguAgapfukamunwa k'Umukungugu
Amadarubindi y'umutekanoAmadarubindi y'umutekano
2

Boil in lye

Boil the flint powder in strong caustic soda lye in an iron cauldron, stirring, topping up with water as it boils away.

Ibikoresho by'iyi ntambwe:

Umunyu w'umuriro (hydroxyde ya sodium)Umunyu w'umuriro (hydroxyde ya sodium)2 litiro

Ibikoresho bikenewe:

Icyombo kinini cy'icyuma gitogosheIcyombo kinini cy'icyuma gitogoshe
InkwiInkwi
Ikiyiko kinini cy'igitiIkiyiko kinini cy'igiti
AmaziAmazi
Amadarubindi yo Kwirinda IbinyabutabireAmadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
3

Boil to strength

Keep boiling until a cooled sample reads close to 2 on the hydrometer, nearly twice as heavy as water.

Ibikoresho bikenewe:

Igipima ubwuzuzanye bw'amaziIgipima ubwuzuzanye bw'amazi
Icyombo kinini cy'icyuma gitogosheIcyombo kinini cy'icyuma gitogoshe
Amadarubindi yo Kwirinda IbinyabutabireAmadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
4

Strain and store

Let it settle, strain the syrupy liquor through cloth from the undissolved grit, and keep it in a closed jar.

Ibikoresho bikenewe:

Umwenda (wo Kuyungurura)Umwenda (wo Kuyungurura)
Icupa ry'IkirahureIcupa ry'Ikirahure
Amadarubindi yo Kwirinda IbinyabutabireAmadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
5

What it holds

Gupakira ikaye ya Jupyter…

Ibikoresho

2

Ibikoresho bikenewe

15

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Sodium Hydroxide by Causticizing Soda Ash with Slaked Lime

Sodium Hydroxide by Causticizing Soda Ash with Slaked Lime

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