Calcium iodide

• Calcium ( II) iodide
• Calciumdidiodid

White to pale yellow solid

3.956 g · cm -3 ( 20 ° C)

740 ° C.

1100 ° C.

Readily soluble in water

Attention

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Calcium iodide is a chemical compound of calcium and is one of the iodides. It is a white to air, slowly yellowing solid.

History

Reduction of calcium iodide with sodium succeeded Henri Moissan first time to produce pure calcium.

Production and representation

Hydrous Calciumiodide crystallize upon concentration of aqueous solutions. Depending on the concentration thereby forming the hexa- or tetra-hydrate. Anhydrous calcium iodide can not win by dehydration of the hydrate itself, instead it can be shown from a solution of calcium hydroxide and iodine. Here, calcium iodide and calcium iodate form, this will be reduced accordingly.

Another possible way of preparing anhydrous Calciumiodides is the decomposition of calcium oxalate with iodine.

Properties

In their properties, the anhydrous and hydrous calcium iodide differ significantly. The various hydrates are slightly deliquescent, crystalline masses, the already melting at 42 ° C, that is, in their own water of crystallization dissolve. Is calcium iodide hydrate in contact with air or light, it can absorb carbon dioxide and give off iodine and discolored as a result yellowish.

The anhydrous calcium iodide, however, is a high-melting crystalline solid which crystallizes in a typical layer structure of the hexagonal cadmium iodide structure. In the gaseous state it bidet linear molecules.

Use

Calcium iodide such as potassium iodide is an expectorant.

In the art, the compound is used as the scintillation crystal, and halogen lamps.