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Lanthanum oxide is an oxide of lanthanum(III), a white powder at room temperature, with a relative density of 6.51 (15/4 °C), a melting point of 2307 °C, and a boiling point of 4200 °C. Insoluble in cold water, it becomes lanthanum hydroxide in hot water, and lanthanum salt of the corresponding acid is formed in dilute inorganic acid, and is insoluble in Chemicalbook acetone. It is comelted with sodium hydroxide to form sodium tetralanthanate. Absorbs carbon dioxide from the air into lanthanum carbonate. It is prepared by burning lanthanum oxalate, lanthanum nitrate, lanthanum carbonate or lanthanum hydroxide. used as analytical reagents and refractories; It is used in the manufacture of optical glass, craft ceramics, gas lamp shades, special alloys, etc.