Question

Please find the 75% equivalence point, 25% equivalence point, Difference in equivalence points, and half equivalence point(pK_a1), and molecular weight range? Then based on the results, determine the unknown acid (possibilities: acetic acid, oxalic acid, benzoic acid, maleic acid, malic acid, and KHP).

standardized NaOH(M) is 0.0840±0.0005 and Used unknown acid was 0.2005g. I did titration curve graph, and found the end point as 44.40.

Below is a data of pH vs. NaOH titration:

V(NaOH), mL	pH
0	1.69
0.5	1.67
1	1.68
1.5	1.68
2	1.69
2.5	1.7
3	1.71
3.5	1.73
4	1.74
4.5	1.75
5	1.76
5.5	1.77
6	1.78
6.5	1.79
7	1.8
7.5	1.81
8	1.82
8.5	1.84
9	1.85
9.5	1.86
9.5	1.87
10	1.88
10.1	1.89
10.2	1.89
10.6	1.92
11	1.93
11.2	1.94
11.5	1.95
12	1.96
12.1	1.98
12.3	1.99
12.5	1.99
12.7	2
12.9	2
13.1	2.01
13.3	2.01
13.5	2.02
13.7	2.03
13.9	2.04
14.1	2.05
14.3	2.06
14.5	2.07
14.7	2.08
14.9	2.09
15	2.13
15.5	2.14
16	2.16
16.5	2.2
17	2.23
17.5	2.26
18	2.3
18.5	2.34
19	2.39
19.5	2.43
20	2.48
20.5	2.54
20.7	2.6
20.9	2.63
21.1	2.65
21.2	2.66
21.4	2.69
21.6	2.72
21.8	2.74
22	2.77
22.2	2.8
22.5	2.83
23	2.89
23.5	2.94
24	3.01
24.5	3.08
25	3.13
25.5	3.19
26	3.24
26.5	3.28
27	3.34
27.5	3.39
28	3.44
28.5	3.48
29	3.53
29.5	3.56
30	3.61
30.2	3.64
30.4	3.65
30.6	3.66
30.8	3.67
31	3.69
31.2	3.7
31.4	3.72
31.6	3.74
31.8	3.76
32	3.77
32.2	3.79
32.4	3.8
32.6	3.82
32.8	3.83
33	3.83
33.2	3.86
33.4	3.87
33.6	3.89
33.8	3.91
34	3.92
34.2	3.93
34.4	3.94
34.6	3.96
34.8	3.99
35	4
35.2	4.01
35.4	4.03
35.6	4.05
35.8	4.06
36	4.09
36.2	4.1
36.4	4.12
36.6	4.13
36.8	4.15
37	4.17
37.2	4.19
37.4	4.21
37.6	4.23
37.8	4.25
38	4.27
38.2	4.29
38.4	4.31
38.6	4.34
38.8	4.35
39	4.38
39.2	4.4
39.4	4.43
39.6	4.45
39.8	4.48
40	4.5
40.2	4.54
40.4	4.57
40.6	4.58
40.8	4.62
41	4.65
41.2	4.69
41.4	4.71
41.6	4.78
41.8	4.81
42	4.84
42.2	4.89
42.4	4.98
42.6	5.05
42.8	5.13
43	5.2
43.2	5.28
43.4	5.46
43.6	5.57
43.8	5.81
44	6.11
44.2	6.74
44.4	8.42
44.6	9.17
44.8	10.14
45	10.33
45.2	10.5
45.4	10.65
45.6	10.79
45.8	10.89
46	10.92
46.2	10.98
46.4	11.05
46.6	11.12
46.8	11.16
47	11.21
47.2	11.23
47.4	11.26
47.6	11.3
47.8	11.33
48	11.35
48.2	11.37
48.4	11.4
48.6	11.42
48.8	11.44
49	11.46
49.2	11.48
49.4	11.5
49.6	11.51
49.8	11.53
50	11.54