Calcium Chloride

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Calcium Chloride

Calcium chloride, CaCl2, is a salt of calcium and chlorine. It behaves as a typical ionic halide, and is solid at room temperature. Common applications include brine for refrigeration plants, ice and dust control on roads, and desiccation. Because of its hygroscopic nature, anhydrous calcium chloride must be kept in tightly sealed, air-tight containers.

Properties

Calcium chloride can serve as a source of calcium ions in an aqueous solution, as calcium chloride is soluble in water. This property can be useful for displacing ions from solution. For example, phosphate is displaced from solution by calcium:

3 CaCl2 (aq) + 2 K3PO4 (aq) → Ca3(PO4)2 (s) + 6 KCl (aq)

Molten calcium chloride can be electrolysed to give calcium metal and chlorine gas:

CaCl2 (l) → Ca (s) + Cl2 (g)

Calcium chloride has a very high enthalpy change of solution. A considerable temperature rise accompanies its dissolution in water.

The anhydrous salt is deliquescent; it can accumulate enough water in its crystal lattice to form a solution.

Usage:
1. They are widely used in highway, expressway, parking lot and port to melting snow and ice
2. Used as dryer, as anti-fog, and antu-dust agent also fireproof agent.
3. Protective agent and refininf agent for petroleum/oil field
4. Pigment assistance agent of textile.It is a kind of raw material
5. It acts as flocctuatio in water treatment
6. Aslo be used in waste papper prcessing as removing printing ink agent.
7. Used in swimming pool to disinfetionand so on.
8. As anti-freezing agent of beton, and speedup harden beton
9. As dehydration agent
*0. Food additive:as cryogen are used in ice cream, as stable agent/coagulant used in bean products, drink and beer