Chemical Properties of Nickel

Peripheral electron arrangement 3d4s, the 4th cycle of the first VIII family. Stronger chemical reactivity, but more stable than iron. It is not easy to oxidize at room temperature and reacts with concentrated nitric acid. The fine nickel wire is flammable and reacts with halogen when heated. It dissolves slowly in dilute acid. It absorbs quite a lot of hydrogen.

Nickel is insoluble in water, and forms a dense oxide film on the surface in humid air at room temperature, which can prevent further oxidation of the metal body. Hydrogen dissolves slowly in dilute acid and is released to produce green nickel ions. Alkali resistance. Nickel in pure oxygen burning in the middle, producing a dazzling white light. Likewise,nickelCan also burn in chlorine and fluorine. Does not react in oxidant solutions including nitric acid. Nickel is a moderately strong reducing agent. Nickel hydrochloride, sulfuric acid, organic acids and alkaline solutions corrode nickel extremely slowly. Nickel dissolves slowly in dilute nitric acid. Fuming nitric acid can passivate the nickel surface and resist corrosion. Like platinum and palladium, nickel absorbs a large amount of hydrogen during the passivation process. The smaller the particle size, the greater the adsorption capacity. Important salts are nickel sulfate and nickel chloride. Nickel nitrate is also commonly used in the laboratory, with crystal water, chemical formula Ni(NO3)2 6H2O, green transparent particles, easy to absorb water vapor in the air. Similar to iron and cobalt , Stable to water and air at room temperature, and resistant to alkaline corrosion. Therefore, nickel crucibles can be used for the melting of alkali in the laboratory. Nickel sulfate (NiSO4) and alkali metal sulfate form alum Ni(SO4) 2o6H2O (MI is an alkali metal ion) . Add divalent nickel ions to form coordination compounds. Under normal pressure, nickel reacts with carbon monoxide to form highly toxic 4-carbonyl nickel (Ni(CO)4), and nickel (Ni(CO)4) is decomposed into nickel and carbon monoxide when heated.