A 1.00 mL pipet sample of dilute acetic acid required 23.4 mL of 0.10 M NaOH to

Question

A 1.00 mL pipet sample of dilute acetic acid required 23.4 mL of 0.10 M NaOH to titrate the sample to a phenolphthalein endpoint.  Calculate the concentration of acetic acid in the sample.  How many significant figures are justified in your answer?  Why?

Explanation / Answer

CH3COOH + NaOH -> CH3COONa +H2O c(NaOH) = n/v n(NaOH) = cv = 0.1 x 0.0234 = 0.00234mol n(CH3COOH) = n(NaOH) = 0.00234mol c(CH3COOH) = n/v = 0.00234/0.001 = 2.34M 3 significant figures are justified in the answer according to thesignificant figure rule. Hope this helps!

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