Potassium iodide is an inorganic compound with the chemical formula KI, which is colorless or white crystal, odorless, and has a strong bitter and salty taste. It is used medicinally as a diuretic, and it can prevent and treat thyroid diseases by adding an appropriate amount to table salt. Potassium iodide can chemically react with many substances, and these reactions are all carried out through the I- in KI. Among halogen ions, I- has the largest radius. Therefore, I- is easy to form complexes with transition metal ions and d-block metal ions; I- has stronger reducibility than Br- and Cl-, and is easily oxidized to I2 element; The solubility of iodide is similar to that of chloride and bromide. The iodide of Ag+, Hg2+, Cu+, Hg2+, and Pb2+ is insoluble, and the precipitates are mostly colored.
1. Potassium iodide has two main uses in surface treatment: first, it is used for chemical analysis, using the intermediate reduction of iodide ions and the reaction of some oxidizing ions to generate elemental iodine, and then calculating the concentration of iodine by measuring iodine. The second analyte is used for the complexation of certain metal ions. Its typical use is as a complexing agent for cuprous and silver in electroplated copper-silver alloys.
2. The so-called iodized edible salt that we often eat is the addition of potassium iodide or potassium iodate to ordinary salt.
3. Potassium iodide has some special uses in the field of dermatology. Its mechanism of action is due in part to enhanced dissolution and digestion of necrotic tissue. Potassium iodide also has antifungal activity. It is used clinically to treat sporangiasis, bacillus pigmentosa, erythema nodosum and vasculitis nodosa. When using potassium iodide, also be aware of its side effects, it can cause pustules, blisters, erythema, eczema, urticaria, etc., it can also make acne worse, and of course gastrointestinal reactions and mucosal symptoms.
4. Potassium iodide can also measure ozone concentration, instead of iodine to make starch blue.
Potassium iodide should be stored in a cool, dry and ventilated warehouse, and should not be stacked in the open air or in a cargo shed. Avoid direct sunlight and moisture to prevent product deterioration. It should be separated from flammable, toxic, acid and volatile odor items, and cannot be stored and transported together. The warehouse should be kept clean frequently. When handling potassium iodide, handle it with care to prevent throwing and damage to the packaging. To prevent rain and exposure to sunlight, the means of transport should be covered and clean, and the goods should not be contaminated to ensure the quality. The storage period should not exceed one year. If there is a fire, it can be put out with water.