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Purified Sodium Hydroxide: Caustic Soda Dissolved in Alcohol, Filtered and Dried in Silver
Commercial caustic soda carries alumina, carbonates, chlorides, phosphates, silicates and sulphates. For analysis, the British Pharmacopoeia of 1898 (quoted in the 1907 US Dispensatory) purified it with alcohol: sodium hydroxide dissolves in alcohol, most of those salts do not, so they are filtered off and the alcohol is evaporated in a silver dish. The result is free of phosphates and sulphates, nearly free of carbonate, but not quite free of alumina. The source gives no quantities, so none are given here.
The picture: sodium hydroxide pellets (Walkerma, Wikimedia Commons, public domain).
중급
A day
안내
1
1
Dissolve the caustic soda in alcohol
Dissolve the caustic soda in alcohol
Put commercial caustic soda in a beaker and stir in alcohol until it has dissolved. Caustic soda burns skin and eyes: wear goggles and gloves.
이 단계의 재료:
가성소다(수산화나트륨)1 as required필요한 도구:
에탄올 - 실험실 등급, 95 %
붕규산 비커
유리 젓개
화학물질 비산 보안경
고무장갑2
2
Filter off what does not dissolve
Filter off what does not dissolve
Filter the solution. The salts that stay behind on the filter are the impurities.
필요한 도구:
자루 달린 유리 깔때기
여과지붕규산 비커화학물질 비산 보안경고무장갑3
3
Evaporate to dryness in a silver dish
Evaporate to dryness in a silver dish
Evaporate the filtrate to dryness in a silver dish, adding a little distilled water from time to time as it goes. Caustic soda attacks glass and porcelain, hence the silver. Alcohol vapour catches fire: use an electric hot plate, no flame, in a well-aired place.
필요한 도구:
은 접시
전열판(핫플레이트)
증류수화학물질 비산 보안경고무장갑4
4
Bottle the purified sodium hydroxide
Bottle the purified sodium hydroxide
The residue is purified sodium hydroxide. It draws water from the air (the source calls it deliquescent), so put it at once into well-stoppered bottles of hard glass. It should show no phosphate or sulphate, at most a trace of carbonate, and it is not quite free of alumina.
필요한 도구:
마개 달린 유리병고무장갑재료
1- 1 as required플레이스홀더
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