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A 30.00-mL sample of weak acid is titrated with 0.0167 M NaOH. At the endpoint , it is found the 40.35 mL of titrant was used. What was the concentration of the weak acid ?

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I assume this is a monoprotic acid.
moles NaOH = M x L
moles weak acid = mol NaOH
M acid = moles acid/L acid.

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