Worksheet & Grading Rubric – Weak Acids and Buffers
In order to find the number of moles of acetate in the buffer solution, you
have to divide the mass gathered by the molar mass. In this case, we gathered
0.0075 moles of acetate.
Use the Henderson–Hasselbalch equation to calculate the theoretical pH of the
buffer solution (prior to the addition of NaOH) using the values obtained in Discussion
Questions 3 and 4 and the theoretical value of
for acetic acid, 1.8
. Discuss this
What was the measured pH of the buffer solution prior to the addition of NaOH?
Use the theoretical pH calculated in Discussion Question 5 and the following equation to
determine and discuss the % error of your results:
The theoretical pH of 4.74 didn’t differ largely from the measured pH of 4.84
leading us to have a fairly low error percentage of 2%.
During the addition of NaOH in
, which buffer species reacted with the
NaOH? Provide the balanced formula unit equation for this reaction.