Platinum is chemically inert and stable in air and humid environment. When heated below 450℃, platinum dioxide film is formed on the surface, which can react with sulfur, phosphorus and halogen at high temperature. Platinum is insoluble in hydrochloric acid, sulfuric acid, nitric acid and alkali solution, but soluble in aqua regia and molten alkali. ?
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Platinum has high chemical stability. It is not only soluble in aqua regia and molten alkali, but also in the mixture of hydrochloric acid and hydrogen peroxide, hydrochloric acid and perchloric acid. In addition, platinum does not react with general strong acids, strong bases and other reagents at room temperature.
However, platinum is susceptible to corrosion at high temperature. For example, platinum is destroyed by various oxidants, strong bases, easily reducible heavy metals, sulfur, phosphorus, arsenic, etc. Or alloy with them. Because of this, it is forbidden to heat or melt alkali metal oxides, sodium thiosulfate, substances containing phosphorus and a lot of sulfur, and samples containing heavy metals (such as lead, tin, antimony, arsenic and mercury). )