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

Dicipta oleh

Charlie

19. Oktober 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).
Pertengahan
A day

Arahan

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.

Bahan untuk langkah ini:

Soda kaustik (natrium hidroksida)Soda kaustik (natrium hidroksida)1 as required

Alatan diperlukan:

Etanol mutu makmal, 95 %Etanol mutu makmal, 95 %
Bikar BorosilikatBikar Borosilikat
Rod Pengacau KacaRod Pengacau Kaca
Gogal Percikan KimiaGogal Percikan Kimia
Sarung tangan getahSarung tangan getah
2

Filter off what does not dissolve

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

Alatan diperlukan:

Corong Kaca BertangkaiCorong Kaca Bertangkai
Kertas TurasKertas Turas
Bikar BorosilikatBikar Borosilikat
Gogal Percikan KimiaGogal Percikan Kimia
Sarung tangan getahSarung tangan getah
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.

Alatan diperlukan:

Pinggan perakPinggan perak
Plat PemanasPlat Pemanas
Air SulingAir Suling
Gogal Percikan KimiaGogal Percikan Kimia
Sarung tangan getahSarung tangan getah
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.

Alatan diperlukan:

Botol kaca bersumbatBotol kaca bersumbat
Sarung tangan getahSarung tangan getah

Bahan

1

Alatan Diperlukan

11

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Natrium Hidroksida — Gred Makmal

Free

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Blueprint berkaitan

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Sodium Hydroxide by Causticizing Soda Ash with Slaked Lime

Sodium Hydroxide by Causticizing Soda Ash with Slaked Lime

oleh CharlieDE

Kimia

22
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0
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0
0
Ethanol 95 %: Wine Distilled, Rectified and Dried over Potash

Ethanol 95 %: Wine Distilled, Rectified and Dried over Potash

oleh CharlieDE

Organik

16
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0
0

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