2.
Step one was repeated for each trial
DATA AND OBSERVATIONS
Weak Acid and Strong Base
Volume of Titrant
Used
Trial 1
Trial 2
Trial 3
Initial pH
2.76
2.67
2.76
5 mL
3.60
3.60
3.60
10 mL
3.94
3.94
3.94
15 mL
4.14
4.18
4.18

Piedmont Hills High School - AP Chemistry 2017-2018
Phan, Madalyn
Period
⅘
Laboratory Experiment: Acid Base Titration
20 mL
4.40
4.40
4.40
25 mL
4.60
4.56
4.52
30 mL
4.76
4.76
4.72
35 mL
4.96
4.90
4.90
40 mL
5.18
5.10
5.10
45 mL
5.46
5.40
5.46
50 mL
5.94
5.82
5.84
55 mL
8.82
8.34
8.26
60 mL
12.94
12.60
12.56
65 mL
13.02
12.92
12.90
70 mL
13.20
13.12
13.12
Strong Acid and Weak Base
Volume of Titrant
Used
Trial 1
Trial 2
Trial 3
Initial pH
0.52
0.52
0.50
5 mL
0.58
0.56
0.56
10 mL
0.64
0.62
0.64
15 mL
0.70
0.68
0.68
20 mL
0.80
0.74
0.74
25 mL
0.86
0.84
0.80
30 mL
0.92
0.90
0.86
35 mL
1.00
0.98
0.96
40 mL
1.08
1.06
1.00
45 mL
1.14
1.14
1.06
50 mL
1.22
1.20
1.14
55 mL
1.30
1.32
1.22

Piedmont Hills High School - AP Chemistry 2017-2018
Phan, Madalyn
Period
⅘
Laboratory Experiment: Acid Base Titration
60 mL
1.38
1.38
1.28
65 mL
1.46
1.48
1.36
70 mL
1.58
1.60
1.46
75 mL
1.70
1.74
1.56
80 mL
1.84
1.90
1.68
85 mL
2.00
2.12
1.80
90 mL
2.22
2.20
1.98
95 mL
2.60
2.39
2.18
100 mL
6.52
6.20
6.08
105 mL
8.54
8.42
8.29
110 mL
8.90
8.88
8.67
115 mL
9.12
9.08
9.03
120 mL
9.28
9.25
9.19
ANALYSIS AND DISCUSSION
1.For the titration of your weak acid and your strong base, what would be the computed pH at the equivalence point? (Show calculations) Include your titration curve here and indicate the equivalence point clearly.

2.
In the titration above, (#1) which did you put in the buret? What would be the
difference in the titration curve if you switched the substances? (That is, if you
placed the strong base in the buret, how would the titration curve change when
you placed the weak acid in the buret instead?)
We put the NaOH in the buret because bases being titrated into acids would turn
the solution pink because of the indicator.
It is a lot easier to detect when the

Piedmont Hills High School - AP Chemistry 2017-2018
Phan, Madalyn
Period
⅘
Laboratory Experiment: Acid Base Titration
solution turns pink as opposed to when it clears.
The titration curve would be a
reflection at the equivalence point if the substances were to be switched.
3.In the titration above (#1), what is the pH at halfway of the equivalence point?

#### You've reached the end of your free preview.

Want to read all 12 pages?

- Winter '20
- pH, Phan, Madalyn, Piedmont Hills High School