CHEM 1412C Titration for Acetic Acid in Vinegar – Lab Report Assistant
 Exercise 1: Determining the Concentration of Acetic Acid
 Data Table 1. NaOH Titration Volume
 Initial NaOH Volume
(mL)
Final NaOH Volume
(mL)
Total volume of NaOH
used (mL)
Trial 1
Trial 2
Trial 3
Average Volume of NaOH Used (mL):
Data Table 2. Concentration of CH3COOH in Vinegar
 Average volume of NaOH
used (mL)
Concentration CH3COOH in
vinegar (mol/L) % CH3COOH in vinegar

Questions:
A) If the manufacturer of the vinegar used in the experiment stated that the vinegar contained
 5.0% acetic acid, what would the percent error between your result and the manufacturer’s
 statement be? Show your work.
 
B) What challenges would you encounter with the titration if you had used apple cider vinegar
 or balsamic vinegar as the analyte instead of distilled white vinegar?
 
C) How would your results have differed if the tip of the titrator was not filled with NaOH
 before the initial volume reading was recorded? Explain your answer.
 
D) How would your results have differed if you had over-titrated (added drops of NaOH to the
 analyte beyond the stoichiometric equivalence point)?
  Tiffany Taylor Unit 2 Dr. Flynn
 E) If a 7.0 mL sample of vinegar was titrated to the stoichiometric equivalence point with 7.5
 mL of 1.5M NaOH, what is the mass percent of CH3COOH in the vinegar sample?
 
F) Why is it important to do multiple trials of a titration, instead of only one trial?
 
G) A student did not read the directions to the experiment properly and mixed up where to
 place the NaOH solution and the vinegar. He put the vinegar in the titrator and the
 measured amount of NaOH in the beaker. He then added a drop of the phenolphthalein to
 the solution in the beaker. Does the student need to empty out all of the solutions and start
 over again or can he go ahead and run the titration? If he runs the titration using the
 solutions as given above, what should he expect to see happen for results?