Question

A 28.00 mL sample of an unknown HClO4 solution requires titration with 20.42 mL of 0.2100 MNaOH 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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