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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).
Menengah
A day
Instruksi
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.
Material untuk langkah ini:
Soda api (natrium hidroksida)1 as requiredAlat yang dibutuhkan:
Etanol mutu laboratorium, 95 %
Gelas Piala Borosilikat
Batang Pengaduk Kaca
Kacamata Pelindung Cipratan Kimia
Sarung tangan karet2
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.
Alat yang dibutuhkan:
Corong Kaca Bertangkai
Kertas Saring
Gelas Piala Borosilikat
Kacamata Pelindung Cipratan Kimia
Sarung tangan karet3
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.
Alat yang dibutuhkan:
Cawan perak
Pelat Pemanas
Air Suling
Kacamata Pelindung Cipratan Kimia
Sarung tangan karet4
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.
Alat yang dibutuhkan:
Botol kaca bersumbat
Sarung tangan karetBahan
1- 1 as requiredPlaceholder
Alat yang Diperlukan
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