400 Ml of an Acetic Acid of Unknown Concentration Is

question 32

Multiple Choice

40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH.After 20.0 mL of the base solution has been added,the pH in the titration flask is 5.10.What was the concentration of the original acetic acid solution? (K_a(CH₃COOH) = 1.8 × 10^-5)

• A)0.11 M
• B)0.022 M
• C)0.072 M
• D)0.050 M
• E)0.015 M

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