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If a 30.0 mL solution of 0.40M barium hydroxide is titrated with 0.25M HCl using an...

If a 30.0 mL solution of 0.40M barium hydroxide is titrated with 0.25M HCl using an indicator, HIn, with a Ka of 3.4x10^-6. What is the total volume of the solution when the indicator first changes color?

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