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Purified Sodium Hydroxide: Caustic Soda Dissolved in Alcohol, Filtered and Dried in Silver
Walkerma (Wikimedia Commons) · Public domain
Charlie

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Charlie

19. Ukwakira 2026DE
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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).
Hagati
A day

Amabwiriza

1

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.

Ibikoresho by'iyi ntambwe:

Umunyu w'umuriro (hydroxyde ya sodium)Umunyu w'umuriro (hydroxyde ya sodium)1 as required

Ibikoresho bikenewe:

Etanoli - urwego rw'ubushakashatsi, 95 %Etanoli - urwego rw'ubushakashatsi, 95 %
Igikombe cya BorosilikateIgikombe cya Borosilikate
Akati k'Ikirahure ko KuvangaAkati k'Ikirahure ko Kuvanga
Amadarubindi yo Kwirinda IbinyabutabireAmadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
2

Filter off what does not dissolve

Filter the solution. The salts that stay behind on the filter are the impurities.

Ibikoresho bikenewe:

Akayunguruzo k'Ikirahure Gafite UmugoziAkayunguruzo k'Ikirahure Gafite Umugozi
Urupapuro rwo KuyungururaUrupapuro rwo Kuyungurura
Igikombe cya BorosilikateIgikombe cya Borosilikate
Amadarubindi yo Kwirinda IbinyabutabireAmadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
3

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.

Ibikoresho bikenewe:

Isahani y'ifezaIsahani y'ifeza
Urubaho rushyushyaUrubaho rushyushya
Amazi YatunganyijweAmazi Yatunganyijwe
Amadarubindi yo Kwirinda IbinyabutabireAmadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
4

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.

Ibikoresho bikenewe:

Amacupa y'ikirahuri afite ibipfundikizoAmacupa y'ikirahuri afite ibipfundikizo
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu

Ibikoresho

1

Ibikoresho bikenewe

11

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