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A.21.4 mL solution of HBt (a strong acid) of unknown concentration was titrated using 0.7175molL1NaOH using phenolphthalein as a pH indicator, At the moment when

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A.21.4 mL solution of HBt (a strong acid) of unknown concentration was titrated using 0.7175molL1NaOH using phenolphthalein as a pH indicator, At the moment when the solution turned a consistent light pink colour, the burette volume read 28.56mL. The initial burette reading before the experiment was 6.78mL. What was the concentration of HBr in the original HBr solution in mol1

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