400 Ml of an Acetic Acid Solution of Unknown Concentration

question 84

Multiple Choice

40.0 ml of an acetic acid solution 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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