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Sodium Hydroxide 10 % Solution: Lye Weighed into Water
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Charlie

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Charlie

14. uMfumfu 2026DE
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Sodium Hydroxide 10 % Solution: Lye Weighed into Water

Many recipes call for caustic soda as a 10 % solution, not as solid lye: for scouring and mercerising cotton, soapmaking, cleaning metal before anodising. It is 100 g of sodium hydroxide in every 1,000 g of solution. Dissolving it gives off a lot of heat, so the lye goes into cold water slowly.
Oqalayo
Half an hour

Imiyalelo

1

Weigh

For 1 kg of solution weigh 100 g of solid lye and 900 g of cold water (see the notebook for other amounts).

Izinto zokwakha zalesi sinyathelo:

I-caustic soda (i-sodium hydroxide)I-caustic soda (i-sodium hydroxide)100 g
AmanziAmanzi900 g

Amathuluzi adingekayo:

Isikali sesilinganisoIsikali sesilinganiso
Ibhikha Le-borosilicateIbhikha Le-borosilicate
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha
2

Lye into water, slowly

Add the lye to the water a little at a time, stirring, never water onto lye. It heats up strongly and can spit: goggles and gloves on.

Amathuluzi adingekayo:

Ibhikha Le-borosilicateIbhikha Le-borosilicate
Induku Yengilazi YokugovuzaInduku Yengilazi Yokugovuza
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha
3

Cool and bottle

Let it cool to room temperature and pour it into a labelled plastic bottle with a tight cap: lye slowly etches glass and takes up carbon dioxide from the air.

Amathuluzi adingekayo:

Ibhodlela lepulasitikiIbhodlela lepulasitiki
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha
4

Weighing other amounts

Ilayisha incwadi ye-Jupyter…

Izinto

2

Amathuluzi Adingekayo

6

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I-sodium hydroxide, isixazululo se-10 %

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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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