Chemistry of the Household

Cover Chemistry of the Household
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This quite reversed the con- dition of the two alkalis, for now soda-ash is much more common, and the manufacture of soap on a large scale really began then. Soda-ash is now the cheapest form of alkali. Caustic soda is made from soda-ash.
CLEANING. 6i The terms, soda-ash, and pot-ash have been used ; soda-Ash these substances in chemical terms are respectively the carbonate of sodium and the carbonate of potas- sium. They are chemical compounds made up of car- bonic acid and two metals — sodium
... and potassium.
When the carbon dioxide, which we have seen is formed by the combustion of carbon, is added to water, carbonic acid results. This is a very weak acid and when it is combined with the very strongly alkaline elements, sodium or potassium, the result is an alka- line substance. Soda-ash and potash (sometimes called pearl-ash) are called alkalis, but they are not nearly so powerful as the hydrates of sodium and potassium which are commonly called caustic soda and caustic potash.
When soda-ash, which is a white powder, is dis- washing solved in hot water and the solution is cooled, crystals of the common washing soda are formed.


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