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Barium hydroxide is a hydroxide of barium. It is used in analytical chemistry for the titration of weak acids, as well as in organic chemistry as a strong base in the hydrolyzation and preparation of other compounds. Barium is a metallic alkaline earth metal with the symbol Ba, and atomic number 56. It never occurs in nature in its pure form due to its reactivity with air, but combines with other chemicals such as sulfur or carbon and oxygen to form barium compounds that may be found as minerals. (L214, 408, L206)