A solution of acetic acid dissolved in water is vinegar. If 3.42 g sample of vinegar was neutralized by 23.6 mL of 0.103 M NaOH, what is the percent by weight of acetic acid in the vinegar?

• A. 4.27 %
• B. 0.143 %
• C. 12.8 %
• D. 31.9 %

Answer: (A)