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A 5.00 mL sample of barium hydroxide is titrated to the phenolphthalein endpoint using hydrocholoric acid. the five mL sample requires 18.02 M HCL solution to reach the endpoint. What is the concentration of the Ba(OH)2 solution?
Ba(OH)2 (aq) + 2 HCL (aq) ----> BaCl2 (aq) + 2H2O (l)

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