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In chemistry, the boiling point is the temperature at which the pressure exerted by the surroundings on a liquid equals the pressure of the vapor it forms, causing the liquid to change from a solid into a gas. The boiling point depends on the concentration (molality) of the solute in the solution; for example, water will have a higher boiling point when dissolved in a non-volatile solvent such as sucrose than it does in pure water. The boiling point of a liquid rises as the concentration of non-volatile solute increases because there are more molecules in the solution and their intermolecular forces are stronger.
The normal boiling point of ki is 1330°C, which is much lower than that of sodium iodide (681°C). This low melting point makes KI more stable and safer to work with. It also oxidizes less readily than sodium iodide, which is important for the use of KI as an iodide source in photography and radiation treatment. However, KI can turn yellow upon heating in air or on standing in moist air for long periods because of oxidation to iodine, which is easily rinsed away with dichloromethane.
KI is usually made by mixing potassium hydroxide with iodine, then heating the solution to decompose the iodate and form KI, and finally filtering the resulting precipitates to get rid of any excess iodine. Another method involves burning seaweed to produce iodine ash, dissolving it in water, and treating it with potassium hydroxide to make KI.