Experiment 4 Name Potentiometric Analysis of Acid in Soft Drinks: Cola vs. Uncola Purpose Calculations A. Standardization of NaOH Mean conc. NaOH solution: M Standard deviation: M Relative standard deviation (%RSD): % B. Data for titration of cola and uncola with NaOH Using Excel or a similar program, make a table with the following columns: Vol. NaOH Added pH V2 - V1 pH2 − pH (V1+V2)/2 pH2 - pH₁ V2 - V1 C. Results Cola: pH of soda after boiling: Volume NaOH required to reach first end point: ± ml; pH: Volume NaOH required to reach second end point: ± ml; pH: H3PO4 concentration: H2PO4 concentration: M %RSD: M %RSD: Uncola: pH of soda after boiling: Volume NaOH required to reach the end point: ± _ml; pH: _ Citric acid concentration: ± M %RSD: Include all information from the Calculations/Questions section as well as sample calculations; answer all questions. Check your calculations carefully! Don't forget to include copies of your lab notebook pages for this experiment. Latest Volume pH d1 d2 (mL) 123 (pH/vol) (d1/vol) 0 2.07 -0.007 0.079 0.4 2.06 0.023 0.087 0.9 2.08 0070 0.089 4 1.3 2.13 0.110 0.057 5 1.5 2.15 0.103 0.022 6 10- 1.9 2.19 0.115 0.039 7 2.2 2.23 0.132 0.057 8 2.5 2.27 0.150 0.074 9 2.9 2.34 0.179 0.117 10 3.3 2.41 0.239 0.157 11 3.6 2.50 0.311 0.086 12 3.8 2.58 0.272 0.124 13 4.4 2.69 0 364 0.275 14 4.6 2.86 0.552 0.198 15 4.9 3.01 0.474 0.029 16 5.3 3.18 0.505 0.153 17 5.7 3.38 0.652 0.086 18 5.9 3.61 0.570 -0.074 19 6.4 3.78 0.531 0.100 20 6.7 3.99 0.679 0.231 21 7 4.23 0.689 0.257 22 7.4 4.44 0.817 0.279 23 7.6 4.71 0 983 -0.553 24 7.8 4.90 0.525 -0.567 pH d1 (pH/vol) d2 (d1/vol) 5- 25 8.3 5.04 0.435 0.019 26 8.6 5.18 0.655 0.187 27 8.9 5.49 0.633 -0.344 28 9.2 5.59 0.388 -0.523 29 9.5 5.70 0 262 -0.265 pH 8.06 Acid-Base Titration 0 5 10 15 20 -0 Volume (mL) 25
Experiment 4 Name Potentiometric Analysis of Acid in Soft Drinks: Cola vs. Uncola Purpose Calculations A. Standardization of NaOH Mean conc. NaOH solution: M Standard deviation: M Relative standard deviation (%RSD): % B. Data for titration of cola and uncola with NaOH Using Excel or a similar program, make a table with the following columns: Vol. NaOH Added pH V2 - V1 pH2 − pH (V1+V2)/2 pH2 - pH₁ V2 - V1 C. Results Cola: pH of soda after boiling: Volume NaOH required to reach first end point: ± ml; pH: Volume NaOH required to reach second end point: ± ml; pH: H3PO4 concentration: H2PO4 concentration: M %RSD: M %RSD: Uncola: pH of soda after boiling: Volume NaOH required to reach the end point: ± _ml; pH: _ Citric acid concentration: ± M %RSD: Include all information from the Calculations/Questions section as well as sample calculations; answer all questions. Check your calculations carefully! Don't forget to include copies of your lab notebook pages for this experiment. Latest Volume pH d1 d2 (mL) 123 (pH/vol) (d1/vol) 0 2.07 -0.007 0.079 0.4 2.06 0.023 0.087 0.9 2.08 0070 0.089 4 1.3 2.13 0.110 0.057 5 1.5 2.15 0.103 0.022 6 10- 1.9 2.19 0.115 0.039 7 2.2 2.23 0.132 0.057 8 2.5 2.27 0.150 0.074 9 2.9 2.34 0.179 0.117 10 3.3 2.41 0.239 0.157 11 3.6 2.50 0.311 0.086 12 3.8 2.58 0.272 0.124 13 4.4 2.69 0 364 0.275 14 4.6 2.86 0.552 0.198 15 4.9 3.01 0.474 0.029 16 5.3 3.18 0.505 0.153 17 5.7 3.38 0.652 0.086 18 5.9 3.61 0.570 -0.074 19 6.4 3.78 0.531 0.100 20 6.7 3.99 0.679 0.231 21 7 4.23 0.689 0.257 22 7.4 4.44 0.817 0.279 23 7.6 4.71 0 983 -0.553 24 7.8 4.90 0.525 -0.567 pH d1 (pH/vol) d2 (d1/vol) 5- 25 8.3 5.04 0.435 0.019 26 8.6 5.18 0.655 0.187 27 8.9 5.49 0.633 -0.344 28 9.2 5.59 0.388 -0.523 29 9.5 5.70 0 262 -0.265 pH 8.06 Acid-Base Titration 0 5 10 15 20 -0 Volume (mL) 25
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Experiment 4
Name
Potentiometric Analysis of Acid in Soft Drinks: Cola vs. Uncola
Purpose
Calculations
A.
Standardization of NaOH
Mean conc. NaOH solution:
M
Standard deviation:
M
Relative standard deviation (%RSD):
%
B.
Data for titration of cola and uncola with NaOH
Using Excel or a similar program, make a table with the following columns:
Vol. NaOH
Added
pH
V2 - V1
pH2 − pH
(V1+V2)/2 pH2 - pH₁
V2 - V1
C.
Results
Cola:
pH of soda after boiling:
Volume NaOH required to reach first end point:
±
ml; pH:
Volume NaOH required to reach second end point:
±
ml; pH:
H3PO4 concentration:
H2PO4 concentration:
M
%RSD:
M
%RSD:
Uncola:
pH of soda after boiling:
Volume NaOH required to reach the end point:
±
_ml; pH: _
Citric acid concentration:
±
M
%RSD:
Include all information from the Calculations/Questions section as well as sample
calculations; answer all questions. Check your calculations carefully! Don't forget to include
copies of your lab notebook pages for this experiment.
Transcribed Image Text:Latest
Volume
pH
d1
d2
(mL)
123
(pH/vol)
(d1/vol)
0
2.07
-0.007
0.079
0.4
2.06
0.023
0.087
0.9
2.08
0070
0.089
4
1.3
2.13
0.110
0.057
5
1.5
2.15
0.103
0.022
6
10-
1.9
2.19
0.115
0.039
7
2.2
2.23
0.132
0.057
8
2.5
2.27
0.150
0.074
9
2.9
2.34
0.179
0.117
10
3.3
2.41
0.239
0.157
11
3.6
2.50
0.311
0.086
12
3.8
2.58
0.272
0.124
13
4.4
2.69
0 364
0.275
14
4.6
2.86
0.552
0.198
15
4.9
3.01
0.474
0.029
16
5.3
3.18
0.505
0.153
17
5.7
3.38
0.652
0.086
18
5.9
3.61
0.570
-0.074
19
6.4
3.78
0.531
0.100
20
6.7
3.99
0.679
0.231
21
7
4.23
0.689
0.257
22
7.4
4.44
0.817
0.279
23
7.6
4.71
0 983
-0.553
24
7.8
4.90
0.525
-0.567
pH d1 (pH/vol) d2 (d1/vol)
5-
25
8.3
5.04
0.435
0.019
26
8.6
5.18
0.655
0.187
27
8.9
5.49
0.633
-0.344
28
9.2
5.59
0.388
-0.523
29
9.5
5.70
0 262
-0.265
pH 8.06
Acid-Base Titration
0
5
10
15
20
-0
Volume (mL)
25
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