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Water Glass: Ground Flints Boiled in Caustic Soda Lye, Ure 1839
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14. Oktoba 2026DE
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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.
Kati
Two days

Maagizo

1

Grind the flints

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

Vifaa kwa hatua hii:

Jiwe la ChalingaJiwe la Chalinga1 kg

Zana zinazohitajika:

Nyundo kubwaNyundo kubwa
Kinu na mchiKinu na mchi
Ungo wa Matundu MembambaUngo wa Matundu Membamba
Mizani ya mizani-mbiliMizani ya mizani-mbili
Barakoa ya vumbiBarakoa ya vumbi
Miwani ya usalamaMiwani ya usalama
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.

Vifaa kwa hatua hii:

Kaustiki soda (hidroksidi ya sodiamu)Kaustiki soda (hidroksidi ya sodiamu)2 lita

Zana zinazohitajika:

Sufuria kubwa ya chuma cha kutupwaSufuria kubwa ya chuma cha kutupwa
KuniKuni
Kasia la mbaoKasia la mbao
MajiMaji
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
Glavu za mpiraGlavu za mpira
3

Boil to strength

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

Zana zinazohitajika:

Kipima-uzito wa majimajiKipima-uzito wa majimaji
Sufuria kubwa ya chuma cha kutupwaSufuria kubwa ya chuma cha kutupwa
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
Glavu za mpiraGlavu za mpira
4

Strain and store

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

Zana zinazohitajika:

Kitambaa (cha Kuchuja)Kitambaa (cha Kuchuja)
Chupa ya KiooChupa ya Kioo
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
Glavu za mpiraGlavu za mpira
5

What it holds

Inapakia daftari la Jupyter…

Vifaa

2

Zana Zinazohitajika

15

Mchoro huu unatengeneza

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Kishikilia nafasi

Glasi ya maji (myeyusho wa silikati ya sodiamu)

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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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