# Problem: A 26.00-mL sample of an unknown HClO4 solution requires titration with 21.92 mL of 0.2100 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)

###### FREE Expert Solution

Recall that at the equivalence point of a titration:

Also, recall that moles = molarity × volume

This means:

$\overline{){\left(\mathbf{MV}\right)}_{{\mathbf{acid}}}{\mathbf{=}}{\left(\mathbf{MV}\right)}_{{\mathbf{base}}}}$

Solving for Macid:

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###### Problem Details

A 26.00-mL sample of an unknown HClO4 solution requires titration with 21.92 mL of 0.2100 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)

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Equivalence Point concept. If you need more Equivalence Point practice, you can also practice Equivalence Point practice problems.