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Hydroxide is an ion. Its chemical formula is OH-. Many hydroxides are basic. The hydroxides of the alkali metals and the alkaline earth metals are strong bases. Most of the transition metal hydroxides are insoluble. Sodium hydroxide, the most common hydroxide, is made by electrolysis of a solution of sodium chloride. Hydroxides can be seen as hydrated oxides. Some metal oxides react with water to make metal hydroxides:
Na2O + H2O --> 2 NaOH