Determination of acetic acid concentration in vinegar

Determination of Acetic Acid Concentration in Vinegar
Using Titration
are labeled with quantities and descriptions.
Laboratory Questions
1. Based on the experimental data, what is the molarity of the vinegar tested? How
does this value compare with those determined in the pre-lab questions?
2. List at least two possible sources of error from the experiment. Would these
errors result in an overestimation or an underestimation of the concentration of
acetic acid in the vinegar.
Discussion Questions
1. Describe on a molecular level the difference between two titrations—one, of a
strong acid with a strong base and the other, of a weak acid with a strong base.
Draw a titration curve for each situation to further illustrate the differences
between strong and weak acids.
Calculate Concentration of Acid
in Vinegar Samples
A sample of 10.0 mL of HCl unknown concentration is
titrated to the endpoint with 6.2 mL of a 1.0 M NaOH
sample. Calculate the concentration of hydrochloric acid.
Write out balanced chemical equation HCl + NaOH  H2O +
NaCl
Determine the moles of sodium hydroxide used to reach
the endpoint. Moles of NaOH= 1.0 M X 6.2 mL x 1 L / 1000