Chemical Properties of Cobalt

cobaltThe valences are 2 and 3. It does not react with water at room temperature and is stable in humid air. COO is formed by oxidation when heated to above 300 degrees Celsius in the air, and burns into COO when it is white hot. The fine cobalt powder produced by hydrogen reduction It can spontaneously ignite in air to form cobalt oxide. Cobalt is a moderately reactive metal as can be seen from the electrode potential. Its chemical properties are similar to those of iron and nickel. Oxidation occurs at high temperatures. When heated, cobalt interacts with oxygen, sulfur, chlorine and Bromine reacts violently to form the corresponding compound. Cobalt dissolves in dilute acid and is passivated by forming an oxide film in fuming nitric acid. Cobalt is slowly corroded by hydrofluoric acid, ammonia, and sodium hydroxide. Cobalt is a bimetallic metal .