Calcium iodide (CaI2) is the ionic compound of calcium and iodine. This colourless deliquescent solid is a salt that is highly soluble in water. Its properties are similar to those for related salts, such as calcium chloride.
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Chemical formula：CaI2
Molar mass：293.887 g/mol (anhydrous) 365.95 g/mol (tetrahydrate)
Appearance：white solid
Density：3.956 g/cm3(anhydrous)
Melting point：575℃
Boiling point：718℃
Solubility：Easily soluble in water, slightly soluble in ethanol and acetone. Its aqueous solution is neutral, and it dissolves in acid to decompose and release iodine or generate hydroiodic acid.
The crystal structure of CaI2 belongs to the cubic crystal system, specifically the body-centered cubic structure. In this structure, each calcium ion is located at the vertex and center of the lattice, while each iodide ion is located at the face center of the lattice.
This structure makes CaI2 stable and uniform. Because the crystal structure of calcium iodide has this special arrangement, it has some unique properties. First of all, calcium iodide is a colorless crystal with good transparency. Secondly, calcium iodide has good solubility and can dissolve quickly in water to release calcium ions and iodine ions. In addition, calcium iodide also has a certain electrical conductivity and can conduct electricity in aqueous solution.
In the field of chemistry, calcium iodide can be used as an analytical reagent for the determination of metal ions such as antimony, zinc and magnesium. In addition, it can also be used to prepare other iodine-containing compounds, such as iodates, iodides, etc. Calcium iodide plays an important role in chemical synthesis by chemically reacting with other compounds.
In the field of medicine, calcium iodide has certain medicinal value. It can be used to treat diseases such as goiter and regulate the iodine balance in the human body by supplementing iodine. In addition, calcium iodide can also be used to prepare some pharmaceutical preparations, such as calcium iodide injection, for the treatment of related diseases.
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