Below is the data for three titrations. In this experiment we have 25 mL (approx. 0.03M)...

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Chemistry

Below is the data for three titrations. In this experiment wehave 25 mL (approx. 0.03M) of various monoprotic acids and weslowly add 50 mL of NaOH while monitoring pH. We add NaOH to changepH about 0.15 after each addition. We add unti lthe total 50 mL ofbase solution (NaOH) is added. Knowing this, for each trial, whatis the equivalence point(s) and the pK_a
Run 1
mL pH
0 1.89
3 1.89
6 2.3
7 2.29
9 2.48
12 2.83
14 3.59
15.5 10.23
16.5 11.69
18 11.97
20 12.12
22 12.27
27 12.4
31 12.46
34 12.54
38 12.58
43 12.66
50 12.68
Run 2
mL pH
0 3.86
1 3.8
3 4.1
4 4.29
4.3 4.48
6 4.61
7.8 4.76
9.4 4.88
11.3 5.01
12.8 5.13
14.8 5.27
16.8 5.44
18.4 5.64
19.8 5.8
21.6 6.02
21.8 6.18
22.1 6.33
22.9 6.78
23.4 7.62
24.1 10.25
24.5 11.24
25.8 11.64
29.5 12.02
33 12.18
36.1 12.3
46 12.46
50 12.52
Run 3
mL pH
0 4.06
5 4.6
8 4.77
10 4.91
13 5.12
15.4 5.26
16.5 5.42
17.7 5.52
18.8 5.62
20 5.8
21 5.96
22 6.35
23 6.74
23.8 7.8

Answer & Explanation Solved by verified expert

4.3 Ratings (656 Votes)

Plot the data for the three curves graphically as shown below Plot 1 Run 1 The pH at the equivalence point is roughly equal to the midpoint of the steep portion of the curve See Answer

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Run 1
mL	pH
0	1.89
3	1.89
6	2.3
7	2.29
9	2.48
12	2.83
14	3.59
15.5	10.23
16.5	11.69
18	11.97
20	12.12
22	12.27
27	12.4
31	12.46
34	12.54
38	12.58
43	12.66
50	12.68




Run 2
mL	pH
0	3.86
1	3.8
3	4.1
4	4.29
4.3	4.48
6	4.61
7.8	4.76
9.4	4.88
11.3	5.01
12.8	5.13
14.8	5.27
16.8	5.44
18.4	5.64
19.8	5.8
21.6	6.02
21.8	6.18
22.1	6.33
22.9	6.78
23.4	7.62
24.1	10.25
24.5	11.24
25.8	11.64
29.5	12.02
33	12.18
36.1	12.3
46	12.46
50	12.52





Run 3
mL	pH
0	4.06
5	4.6
8	4.77
10	4.91
13	5.12
15.4	5.26
16.5	5.42
17.7	5.52
18.8	5.62
20	5.8
21	5.96
22	6.35
23	6.74
23.8	7.8