Experiment 7 - Acetic Acid Content of Vinegar

Procedure:

Part B - Determination of Acetic Acid Concentration in Vinegar

1. Fill the buret to the 0.00 mL mark with the same base solution used in Part A.
2. Obtain about 40 mL of vinegar in a clean and dry 100 mL beaker.
3. Pipet 5.00 mL of vinegar solution into 125 mL Erlenmeyer flask.
4. Add 2-3 drops of phenolphthalein.
5. Add the base solution, which is in the buret to the acid solution in the flask until the end point is reached.
6. Read the buret carefully to determine the quantity of base used to reach the end point. Record the volume of the base solution used.
7. Repeat until two volumes are obtained and agree within 0.10 mL.

Clean Up:

Rinse the buret with distilled water and leave it filled with distilled water and place the protective cap on the top of the buret.