Buffer Design Lab.pdf - Buffer Design Lab Lauryn McKenna...

Buffer Design Lab
Lauryn McKenna
Ashlynn Adams and Leah Burge
10 February 2020

Analysis
The NaOH buffer was able to neutralize 31 mL of citric acid and the HCl buffer was able to
neutralize 33 mL of dihydrogen citrate before the pH changed by more than one unit. The NaOH
was able to neutralize .014 mol citric acid and the HCl was able to neutralize .005 mol
NaH
2
C
6
H
5
O
7
. Overall, the ratio of moles of base neutralized to moles of acid in buffer is 1.6:1
and the moles of acid neutralized to the moles of base in the buffer is .56:1.
Conclusion
A weak acid, citric acid, and a weak base, dihydrogen citrate, were mixed together to
form a buffer solution. A strong acid, HCl, and a strong base, NaOH, were added separately to
titrate the solution. When HCl was added to the solution, it neutralized the weak base and when
NaOH was added to the solution, it neutralized the weak acid. The titrations, overall, created a
buffer which had a buffer zone. The buffer zone was the volume of titrant added, where the pH