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Concentration of a Strong Acid

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A 20.0 mL sample of $HNO_3$ is titrated with 10.0 mL of a 0.15 M $KOH$ solution.

What is the concentration of $HNO_3$?

A

0.075 M

B

0.15 M

C

0.23 M

D

0.30 M