Iridium characteristics
Iridium is a platinum element. Platinum-based elements are almost completely in the form of a simple state, highly dispersed in a variety of minerals, such as the original platinum ore, nickel sulfide copper, magnetite and so on. Platinum elements exist almost without exception, the formation of natural alloys. In the platinum-containing elemental ore, platinum is usually the main component, and the rest of the platinum element due to the smaller content, must be chemically analyzed to be found. Since osmium, iridium, palladium, rhodium and ruthenium all form an ore with platinum, they are all found in the residue from platinum. The platinum is chemically stable. They are in addition to platinum and palladium, not only insoluble in ordinary acid, and insoluble in aqua regia. Platinum is easily soluble in aqua regia, palladium is also dissolved in hot nitric acid. All platinum-based elements tend to form strong coordination compounds. In 1803, the French chemist Kohler Shi