Vinegar contains acetic acid (HC₂H₃O₂), which is responsible for its acidity. In one analysis of a commercial vinegar brand, a 15.00 mL sample was titrated with 0.450 M NaOH(aq). It required 30.5 mL of sodium hydroxide to neutralize the acid in the vinegar sample. What is the molar concentration of acetic acid in the vinegar?

Question

Quizplus · Accepted Answer

The neutralization reaction is HC2H3O2 + NaOH → NaC2H3O2 + H2O. The moles of NaOH used are 0.450 M * 0.0305 L = 0.013725 moles. Since the reaction is 1:1, moles of acetic acid = moles of NaOH = 0.013725. The concentration of acetic acid is 0.013725 moles / 0.015 L = 0.915 M.

Vinegar Contains Acetic Acid (HC2H3O2), Which Is Responsible for Its

Vinegar Contains Acetic Acid (HC₂H₃O₂), Which Is Responsible for Its