Cobalt hydroxide is a kind of fine inorganic compounds, usually for the rose red monoclinic crystal or tetragonal crystal system, relative density 3.597 (15 ℃) heat decomposition. Soluble in acid and ammonium salt solution, insoluble in water and ethanol. With some organic acid reaction generated containing cobalt soap. When heated easy to decompose. In a vacuum heating at 160 ℃ water loss into the CoO. More lively, also can response in weak acid aqueous solution of salt formation, the oxygen to exist, rapid response state into a high price.