Determination of Acetic Acid Concentration Experiment.docx...

Experiment: Determination of Acetic Acid Concentration
Felicity Ugbaja
Dallas County College
Chemistry 1412

2
Determination of Acetic Acid
Concentration in Vinegar Using Titration 580314
The goal of this LAB is to accurately determine the concentration of acetic acid in commercial
vinegar. Titration, a common laboratory chemical analytical procedure is used to determine the
concentration. During the titration, acetic acid is neutralized with a solution of sodium
hydroxide. The titration is performed three times and the average molarity of acetic acid is
determined. The percent of acetic acid in vinegar is calculated from the molarity. In Activity 1,
the percent of acetic acid in the included vinegar sample is determined. In Activity 2, a different
sample of vinegar will be used and titrated. Activity 3 is a paper activity to calculate the pKa of
the acetic acid based on sample pH data that is provided.
Materials
Syringe, 10 mL
10-mL graduated cylinder
25-mL Erlenmeyer flask
Electronic balance
Disposable pipet
Plastic cup, 1.25 oz
Vinegar, acetic acid solution

3
Phenolphthalein indicator solution, 1%
Sodium hydroxide solution, 1M
Plain sheet of white paper
Vinegar sample
Video
Activity 1: Titration of Vinegar with Sodium Hydroxide
1. Place the 10-mL graduated cylinder on the electronic balance.