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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).
Katamtaman
A day
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Lihiya (sodium hydroxide)1 as requiredMga kailangang kasangkapan:
Etanol - antas laboratoryo, 95 %
Basong Borosilikato
Panghalong Salamin
Salamin Laban sa Tilamsik ng Kemikal
Gwantes na goma2
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.
Mga kailangang kasangkapan:
Embudong Salamin na May Tangkay
Papel na PansalaBasong BorosilikatoSalamin Laban sa Tilamsik ng KemikalGwantes na goma3
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.
Mga kailangang kasangkapan:
Pilak na Pinggan
Pang-init na Plato
Distiladong TubigSalamin Laban sa Tilamsik ng KemikalGwantes na goma4
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.
Mga kailangang kasangkapan:
Mga boteng salamin na may taponGwantes na gomaMga Materyales
1- 1 as requiredPlaceholder
Mga Kinakailangang Kasangkapan
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