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A 23.00 ?mL sample of an unknown HClO4 solution requires titration with 22.52 mL of 0.2200...

A 23.00 ?mL sample of an unknown HClO4 solution requires titration with 22.52 mL of 0.2200 M NaOH to reach the equivalence point. What is the concentration of the unknown HClO4 solution? The neutralization reaction is: HClO4(aq)+NaOH(aq)?H2O(l)+NaClO4(aq) Express your answer using four significant figures.

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