soda: see sodium carbonate.

Nonalcoholic beverage, usually carbonated, consisting of water (soda water), flavouring, and a sweet syrup or artificial sweetener. Attempts to reproduce the natural effervescence of certain spring waters for presumed health benefits began before 1700. Joseph Priestley's experiments with “fixed air” (carbon dioxide) led in the late 1790s to the successful preparation of carbonated “mineral water” by Jacob Schweppe of Geneva; by the early 1800s it was being bottled and sold commercially. Today there are hundreds of varieties of flavoured soft drinks. Some of the world's largest corporations (including Coca-Cola Co. and PepsiCo) founded their businesses on soft-drink manufacturing.

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or ammonia-soda process

Modern method of manufacturing sodium carbonate (soda ash), devised and commercialized in Belgium by Ernest Solvay (1838–1922). Common salt (sodium chloride) is treated with ammonia and then carbon dioxide, under carefully controlled conditions, to form sodium bicarbonate and ammonium chloride. When heated, the bicarbonate yields sodium carbonate, the desired product; the ammonium chloride is treated with lime to produce ammonia (for reuse) and calcium chloride. The process proved of great commercial value, since large quantities of soda ash are used in making glass, detergents, and cleansers. Seealso caustic soda.

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