Titration of Vinegar Lab!

In this lab we were trying to figure out the Molar Concentration of Acetic Acid in household vinegar.

For the lab we set up a buret on a lab-stand with a clamp. Then we filled the buret with 0.50M NaOH, and filled an Erlenmeyer flask with 10mL of vinegar and added two drops of Phenolphthalein Indicator to it. After we recorded the initial volume of the NaOH in the buret, we added NaOH to the vinegar and swirled the flask until the solution turned light pink. We then recorded the final volume to find the total amount of NaOH added in the trial. We repeated this step at least once more.





Next we had to determine the average volume of NaOH added.

16.9 + 17.1 = 34.0

34.0/2 = 17.0

Average volume = 17.0mL

Then we had to determine the concentration of Acetic Acid using the balanced eqaution for the reaction of Sodium Hydroxide with Acetic Acid.

CH3COOH + NaOH -> HOH + NaCH3COO

0.50mol/L x 17.0mL x 1/1 = 8.5mmol

8.5mmol x 1/10mL = 0.85M

The accepted vaule for the concentration of household vinegar is 0.85M

Calculating our percent error we get:

0.85 - 0.85 / 0.85 x 100 = 0% error

Here is a video to show you visually what we did for this lab!