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Potassium iodide, also known by the chemical formula KI, is an inorganic compound that serves as a convenient source of iodine. It is water-soluble and can be converted to elemental iodine with hydrochloric acid or hydrogen peroxide. It is also used as a scavenger of free radicals and an expectorant. It is an important component of iodine therapy for thyroid disease and has been studied in connection with radiation protection, medicinal uses and analytical chemistry.
A solution’s boiling point is the temperature at which the molecules of that solution begin to move more rapidly than they do in their pure state and become arranged randomly, instead of in tight bonds. This increase in kinetic energy requires more heat to overcome the attractive forces between particles of different substances. These forces are called intermolecular forces and include dipole-dipole attractions, London dispersion forces and electrostatic attraction between positively charged ions.
In general, ionic compounds have higher boiling points than covalent ones. This is because the ionic bonds are stronger than the covalent ones. However, if the compounds are very large or have a high density, they can develop strong London dispersion forces and still boil at lower temperatures.
A common method to estimate the boiling point elevation of a solution is to multiply the temperature at which the solution begins to boil (Tsolvent) by the ebullioscopic constant or boiling point elevation constant for that solvent, which is usually given in a table for chemistry. For example, the ki boiling point is calculated as Tsolvent * 0.512oCm.