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Manganese dioxide MnO2 powder.
Manganese dioxide is an inorganic compound with the chemical formula MnO2, which exists in nature in the form of soft manganese ore. Physical properties. Black amorphous powder or black square crystal. Solubility: insoluble in water.

Manganese dioxide is an alpha polycrystal that can incorporate various atoms (and water molecules) in the "tunnels" or "channels" between the octahedra of manganese oxide. There is great interest in the possibility of using alpha-MnO2 as an anode for lithium-ion batteries.

Characteristics of manganese dioxide MnO2
Manganese dioxide MnO2 is an amphoteric oxide. It is a very stable black powdered solid at room temperature and can be used as a depolarizing agent in dry cells. In the laboratory, it is often used to produce chlorine gas by its oxidizing properties and by concentrating hydrochloric acid. Manganese dioxide is a strong oxidizing agent in acidic media. Manganese dioxide is a MnO2 octahedron. The oxygen atoms are on the top of the octahedron and the manganese atoms are on the inside of the octahedron. mnO2 octahedra are linked together to form single or double chains. These chains form hollow tunnel structures with other chains on top together in octahedral or hexahedral dense or dense square rows.
Manganese dioxide is an amphoteric oxide and the corresponding salts exist in the form of calixarene structures, such as BaMnO3 or SrMnO3 (obtained by complex reactions in molten alkali systems) and manganese tetrachloride.

Manganese dioxide MnO2 CAS 1313-13-9 Product properties.
Physical properties. Black amorphous powder or black rhombic crystal. Solubility: insoluble in water, weak acids, weak bases, nitric acid, cold sulfuric acid, soluble in concentrated hydrochloric acid, produces chlorine gas when hot.
Chemical properties. Manganese dioxide is an amphoteric oxide. There are salts in the form of corresponding chalcopyrite structures, such as BaMnO3 or SrMnO3 (obtained by complex reactions in molten alkali systems). There is also manganese tetrachloride.
It exhibits oxidizing properties when encountered with reducing agents. If manganese dioxide is placed in a stream of hydrogen and heated to 1400 K, manganese oxide is obtained; if manganese dioxide is heated in a stream of ammonia, brown-black manganese trioxide is obtained; manganese dioxide reacts with concentrated hydrochloric acid to produce manganese chloride, chlorine and water.
It also exhibits reducing properties when encountering strong oxidizing agents. It is a strong oxidizer in acidic media.

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