Determine which polyprotic acid from the list is the unknown acid.

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter4: Stoichiometry: Quantitative Information About Chemical Reactions
Section: Chapter Questions
Problem 60PS
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Question

Determine which polyprotic acid from the list is the unknown acid.

Tanyia Chery
Results:
1.
Value of pKal from graph.
25
2.
Value of pKa2 from graph.
pla,=-logka
%3D
3. Value of Kal-
log ka
%3D
4.
Value of Ka2.
7=-logka
5. Using the list of polyprotic acids,
below, determine the identity of the
unknown acid.
Name of Acid
K22
Acetic acid
1.8 x 105
Boric acid
7.3 x 10-10
1.8 x 10-13
Itaconic acid
1.4 x 104
3.6 x 106
Oxalic acid
5.9 x 102
6.5 x 105
7.3 x 103
6.2 x 10%
Phosphoric acid
1.0 x 103
4.5 x 105
Tartaric acid
1.0 x 103
4.0 x 10-14
Salicylic acid
7.9 x 105
1.6 x 10-12
Ascorbic acid
1.5 x 10-10
1.4 x 10+
D/L Aspartic acid
Transcribed Image Text:Tanyia Chery Results: 1. Value of pKal from graph. 25 2. Value of pKa2 from graph. pla,=-logka %3D 3. Value of Kal- log ka %3D 4. Value of Ka2. 7=-logka 5. Using the list of polyprotic acids, below, determine the identity of the unknown acid. Name of Acid K22 Acetic acid 1.8 x 105 Boric acid 7.3 x 10-10 1.8 x 10-13 Itaconic acid 1.4 x 104 3.6 x 106 Oxalic acid 5.9 x 102 6.5 x 105 7.3 x 103 6.2 x 10% Phosphoric acid 1.0 x 103 4.5 x 105 Tartaric acid 1.0 x 103 4.0 x 10-14 Salicylic acid 7.9 x 105 1.6 x 10-12 Ascorbic acid 1.5 x 10-10 1.4 x 10+ D/L Aspartic acid
Data Table:
Volume
Base Added
Volume Base
Added
Volume Base
Hd
Hd
Added
Hd
0.0 mL
13.0 mL
6.50
26.0 mL
0.5 mL
bの1
13.5 mL
26.5 mL
1.0 mL
14.0 mL
|1.51
L7の
のLつ
27.0 mL
1.5 mL
14.5 mL
27.5 mL
11.54
2.0 mL
15.0 mL
28.0 mL
11.57
2.5 mL
15.5mL
28.5 mL
3.0 mL
2し1
16.0 mL
.82
1.86
7.03
29.0 mL
3.5 mL
16.5 mL
29.5 mL
11.65
7.13
7.25
4.0 mL
17.0 mL
30.0 mL
4.5mL
1.96
17.5 mL
7.37
30.5mL
5.0 mL
2.02
18.0 mL
7.51
31.0mL
18.5 mL
31.5 mL
IL'L
8.05
5.5 mL
6.0 mL
2,15
19.0 mL
32.0 mL
6.5 mL
2.25
19.5 mL
32.5 mL
33.0 mL
しL1
2.34
20.0 mL
10.21
10.56
7.0mL
20.5 mL
33.5mL
7.5 mL
18:11
I1.83
21.0 mL
34.0 mL
8.0 mL
21.5 mL
16.88
34.5 mL
8.5 mL
35.0 mL
22.0 mL
9.0 mL
b699
9.5 mL
3.62
22.5 mL
5.28
23.0 mL
11.14
10.0 mL
|1.21
11.26
23.5 mL
10.5 mL
24.0 mL
11.0 mL
11.31
しb'S
24.5 mL
11.5 mL
11.36
25.0 mL
12.0mL
6.28
11.40
25.5 mL
12.5 mL
6.39
Transcribed Image Text:Data Table: Volume Base Added Volume Base Added Volume Base Hd Hd Added Hd 0.0 mL 13.0 mL 6.50 26.0 mL 0.5 mL bの1 13.5 mL 26.5 mL 1.0 mL 14.0 mL |1.51 L7の のLつ 27.0 mL 1.5 mL 14.5 mL 27.5 mL 11.54 2.0 mL 15.0 mL 28.0 mL 11.57 2.5 mL 15.5mL 28.5 mL 3.0 mL 2し1 16.0 mL .82 1.86 7.03 29.0 mL 3.5 mL 16.5 mL 29.5 mL 11.65 7.13 7.25 4.0 mL 17.0 mL 30.0 mL 4.5mL 1.96 17.5 mL 7.37 30.5mL 5.0 mL 2.02 18.0 mL 7.51 31.0mL 18.5 mL 31.5 mL IL'L 8.05 5.5 mL 6.0 mL 2,15 19.0 mL 32.0 mL 6.5 mL 2.25 19.5 mL 32.5 mL 33.0 mL しL1 2.34 20.0 mL 10.21 10.56 7.0mL 20.5 mL 33.5mL 7.5 mL 18:11 I1.83 21.0 mL 34.0 mL 8.0 mL 21.5 mL 16.88 34.5 mL 8.5 mL 35.0 mL 22.0 mL 9.0 mL b699 9.5 mL 3.62 22.5 mL 5.28 23.0 mL 11.14 10.0 mL |1.21 11.26 23.5 mL 10.5 mL 24.0 mL 11.0 mL 11.31 しb'S 24.5 mL 11.5 mL 11.36 25.0 mL 12.0mL 6.28 11.40 25.5 mL 12.5 mL 6.39
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