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Calcium iodide (chemical formula CaI 2) 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. It is used in photography. [1] It is also used in cat food as a source of iodine.
The tables below provides information on the variation of solubility of different substances (mostly inorganic compounds) in water with temperature, at one atmosphere pressure. Units of solubility are given in grams of substance per 100 millilitres of water (g/(100 mL)), unless shown otherwise.
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
Similarly, solubilities in water of predominantly ionic iodides (e.g. potassium and calcium) are the greatest among ionic halides of that element, while those of covalent iodides (e.g. silver) are the lowest of that element. In particular, silver iodide is very insoluble in water and its formation is often used as a qualitative test for iodine. [7]
Additives: Nearly 70% of table salt in the United States is fortified with iodide, a necessary nutrient that's been added to salt since the 1920s to help prevent iodine deficiency, ...
Very soluble <1 calcium nitrate: 158.7 0.63 Freely soluble 1 to 10 calcium chloride: 65 1.54 Soluble 10 to 30 sodium oxalate: 3.9 26 Sparingly soluble 30 to 100 Slightly soluble 100 to 1000 calcium sulfate: 0.21 490 Very slightly soluble 1000 to 10,000 dicalcium phosphate: 0.02 5000 Practically insoluble or insoluble ≥ 10,000 barium sulfate ...
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These salts are all poorly soluble in water. Among the halides, the iodide is less soluble than the bromide, which, in turn, is less soluble than the chloride. [3] Lead(II) oxide is also soluble in alkali hydroxide solutions to form the corresponding plumbite salt. [2] PbO + 2 OH − + H 2 O → Pb(OH) 2− 4