Data Tables:
Drops of   HCl added | pH Beaker 1 Acetic Acid + Acetate | pH Beaker 2 Ammonia + Ammonium | pH Beaker 3 Water |
0 drops | 4.86 | 9.55 | 5.49 |
2drops | 4.76 | 9.46 | 2.61 |
4drops | 4.61 | 9.35 | 2.34 |
6 drops | 4.50 | 9.24 | 2.17 |
8 drops | 4.36 | 9.12 | 2.06 |
10drops | 4.21 | 8.96 | 1.99 |
12drops | 4.02 | 8.75 | 1.90 |
Drops of NaOH added | pH Beaker 1 Acetic Acid + Acetate | pH Beaker 2 Ammonia+ Ammonium | pH Beaker 3 Water |
0 drops | 4.97 | 9.72 | 8.90 |
2drops | 5.04 | 9.76 | 11.68 |
4drops | 5.10 | 9.82 | 12.00 |
6drops | 5.17 | 9.88 | 12.20 |
8drops | 5.24 | 9.95 | 12.33 |
10drops | 5.32 | 10.02 | 12.40 |
12drops | 5.40 | 10.10 | 12.50 |
Post lab Questions (written or type out on a separatesheet):
(Q1) According to your graphed data is one buffer (beaker 1-3)better or worse than the other(s)? Explain.
(Q2) Write out the chemical reaction that occurs in the AceticAcid / Acetate buffer when
NaOH is added
HCl is added
(Q3) Write out the chemical reaction that occurs in theAmmonia/Ammonium buffer when
NaOH is added
HCl is added
(Q4) Write out the chemical reaction that occurs in theDistilled water when
NaOH is added
HCl is added
(Q5) Does distilled water make a good buffer? Why or whynot?
(Q6) How can you tell if the buffer is working?
(Q7) What happens when you go beyond the buffer capacity? How isbuffer capacity indicated on your graph(s)?
