Name ______________________________
Lab (Circle) W AM F AM F PM Date _______________
Partner______________________________
Pre-Lab Questions – Answers to these questions are generally found in the lab write up
Classify the following reactions as Combination, Decomposition, Single Replacement, or Double
Replacement.
1. What is the definition of Molarity?
2. What is an acidic proton?
3. Write the balanced equation for the reaction of acetic acid, CH3COOH, with sodium
hydroxide.
4. Why is it necessary to use an indicator in the titration?
5. If a titration with 0.20 M NaOH requires 14.7 mL of the base, how many moles of base are
used?
Name ______________________________
Lab (Circle) W AM F AM F PM Date _______________
Partner______________________________
Post-Lab Questions – These are usually related to the techniques or calculations done during the lab.
1. The water that is added to the vinegar is not measured carefully. Why doesn’t it matter how much
water is added to the vinegar?
2. Why is it important to rinse the buret with the solution to be used in the titration?
3. A 2.00 mL sample of a solution of benzoic acid, C6H5-COOH (molar mass = 122.12 g/mol), is titrated
with 0.20 M NaOH . The titration required 15.7 mL of the sodium hydroxide.
C6H5-COOH(aq) + NaOH(aq)
C6H5-COONa(aq) + H2O(l)
(a) How many moles of NaOH was used in the titration ?
(b) How many moles of benzoic acid are in the sample?
(c) How many grams of benzoic acid are in the sample?
(e) If the solution has a mass of 2.00 g (meaning the density is 1.00 g/mL), what is the percent
composition by mass of the benzoic acid solution?