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Youblob · CC0
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.
Beginner
Half an hour
Instructions
1
1
Weigh
Weigh
For 1 kg of solution weigh 100 g of solid lye and 900 g of cold water (see the notebook for other amounts).
Materials for this step:
Lye (Sodium Hydroxide)100 g
Water900 gTools needed:
Balance Scale
Borosilicate Beaker
Chemical Splash Goggles
Rubber Gloves2
2
Lye into water, slowly
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.
Tools needed:
Borosilicate Beaker
Glass Stirring RodChemical Splash GogglesRubber Gloves3
3
Cool and bottle
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.
Tools needed:
Plastic BottleChemical Splash GogglesRubber Gloves4
4
Weighing other amounts
Weighing other amounts
Loading Jupyter Notebook...
Tools Required
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