calcium chloride


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calcium chloride,

CaCl2, chemical compound that is crystalline, lumpy, or flaky, is usually white, and is very soluble in water. The anhydrous compound is hygroscopic; it rapidly absorbs water and is used to dry gases by passing them through it. Calcium chloride is commercially available usually as the dihydrate, CaCl2·2H2O; it is used to melt ice on roads, to control dust, in brines for refrigeration, and as a preservative in foods. It is also used in the monohydrate and hexahydrate forms. Calcium chloride is a byproduct of the Solvay processSolvay process
[for Ernest Solvay], commercial process for the manufacture of sodium carbonate (washing soda). Ammonia and carbon dioxide are passed into a saturated sodium chloride solution to form soluble ammonium hydrogen carbonate, which reacts with the sodium chloride to
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 (a major source of the compound) and is present in natural brines.

Calcium Chloride

 

CaCl2, a salt; colorless crystals with a density of 2.51 g/cm3 and melting point of 772°C. Calcium chloride easily absorbs water vapor, subsequently deliquescing. Its solubility per 100 g H2O is 74 g at 20°C and 159 g at 100°C. Aqueous solutions of calcium chloride freeze at low temperatures (20-percent solution at — 18.5°C and 30-percent solution at — 48°C). Calcium chloride forms the hydrate CaCl2 • 6H2O, which remains stable up to 29.8°C;at high temperatures, crystalline hydrates are precipitated from the saturated solution with four, two, and one molecules of H2O. When CaCl2⋅6H2O (58.8 percent) is mixed with snow or ice (41.2 percent), the temperature drops to — 55°C (cryohydric point).

Calcium chloride is obtained as a byproduct in the manufacture of soda and is used for the preparation of calcium metal, in the drying of gases and liquids, in refrigeration, and in medicine.

calcium chloride

[′kal·sē·əm ′klȯr‚īd]
(inorganic chemistry)
CaCl2 A colorless, deliquescent powder that is soluble in water and ethanol; used as an antifreeze and as an antidust agent.

calcium chloride

A chemical salt used in plastic concrete as an accelerator.
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