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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.
初学者
Half an hour
说明
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).
此步骤所需材料：
烧碱（氢氧化钠）100 克
水900 克所需工具：
等臂天平
硼硅玻璃烧杯
化学防溅护目镜
橡胶手套2
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.
所需工具：
硼硅玻璃烧杯
玻璃搅拌棒化学防溅护目镜橡胶手套3
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.
所需工具：
塑料瓶化学防溅护目镜橡胶手套4
4
Weighing other amounts
Weighing other amounts
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