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Potassium iodide has the chemical formula K I. [8] Commercially it is made by mixing potassium hydroxide with iodine. [9] [10] Potassium iodide has been used medically since at least 1820. [11] It is on the World Health Organization's List of Essential Medicines. [12] Potassium iodide is available as a generic medication and over the counter. [13]
Chemical formula. I − Molar mass: 126.904 47 g·mol −1 Conjugate acid: ... Potassium iodide: KI white crystals iodine component of iodized salt
Potassium iodate, KIO 3, like potassium iodide, has been issued as a prophylaxis against radioiodine absorption in some countries. [4] [5] It is also one of the iodine compounds used to make iodized salt. [6] Potassium hydrogen iodate (or potassium biiodate), KH(IO 3) 2, is a double salt of potassium iodate and iodic acid, as well as an acid ...
It can also be prepared by adding iodine to a hot, concentrated solution of potassium hydroxide: [1] 3 I 2 + 6 KOH → KIO 3 + 5 KI + 3 H 2 O. Or by fusing potassium iodide with potassium chlorate, bromate or perchlorate, the melt is extracted with water and potassium iodate is isolated from the solution by crystallization: [2] KI + KClO 3 → ...
To this a solution containing potassium iodide, sodium thiosulfate, and starch is added. There are two reactions occurring simultaneously in the solution. In the first, slow reaction, iodine is produced: H 2 O 2 + 2 I − + 2 H + → I 2 + 2 H 2 O. In the second, fast reaction, iodine is reconverted to two iodide ions by the thiosulfate:
Its formation explains why the solubility of iodine in water may be increased by the addition of potassium iodide solution: [11] I 2 + I − ⇌ I − 3 (K eq = ~700 at 20 °C) Many other polyiodides may be found when solutions containing iodine and iodide crystallise, such as I − 5, I − 9, I 2− 4, and I 2−
Silver iodide is prepared by reaction of an iodide solution (e.g., potassium iodide) with a solution of silver ions (e.g., silver nitrate). A yellowish solid quickly precipitates. The solid is a mixture of the two principal phases. Dissolution of the AgI in hydroiodic acid, followed by dilution with water, precipitates β-AgI.
Chemical formula. AsI 3 Molar mass: 455.635 g/mol Appearance ... It is prepared by a reaction of arsenic trichloride and potassium iodide: [6]