HA/A- Ratios with given Ka (pseudo titration of HA)

Start... Buffer Zone... Equivalence Point... Overshoot...

The following table is LIKE a titration in that many RATIOS of HA/A- are created during a titation. It is not exactly a titration only because the ratios shown have no dilution effect calculated into the equation. Imagine titrating with little additions of solid NaOH. The volume would stay about the same throughout the titration and you would get close to the results shown in this table. - Dr. McCord

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HA/A- Ratios with a given Ka

Ka = 1.80 × 10-5     pKa = 4.74    start    buffer zone    equivalence pt    overshoot

[HA][A–][H+]pH
0.10001.33 × 10-31.33 × 10-32.88
0.09900.0011.78 × 10-32.75
0.09800.0028.82 × 10-43.05
0.09700.0035.82 × 10-43.24
0.09600.0044.32 × 10-43.36
0.09500.0053.42 × 10-43.47
0.09400.0062.82 × 10-43.55
0.09300.0072.39 × 10-43.62
0.09200.0082.07 × 10-43.68
0.09100.0091.82 × 10-43.74
0.09000.0101.62 × 10-43.79
0.08900.0111.46 × 10-43.84
0.08800.0121.32 × 10-43.88
0.08700.0131.20 × 10-43.92
0.08600.0141.11 × 10-43.96
0.08500.0151.02 × 10-43.99
0.08400.0169.45 × 10-54.02
0.08300.0178.79 × 10-54.06
0.08200.0188.20 × 10-54.09
0.08100.0197.67 × 10-54.11
0.08000.0207.20 × 10-54.14
0.07900.0216.77 × 10-54.17
0.07800.0226.38 × 10-54.20
0.07700.0236.03 × 10-54.22
0.07600.0245.70 × 10-54.24
0.07500.0255.40 × 10-54.27
0.07400.0265.12 × 10-54.29
0.07300.0274.87 × 10-54.31
0.07200.0284.63 × 10-54.33
0.07100.0294.41 × 10-54.36
0.07000.0304.20 × 10-54.38
0.06900.0314.01 × 10-54.40
0.06800.0323.83 × 10-54.42
0.06700.0333.65 × 10-54.44
0.06600.0343.49 × 10-54.46
0.06500.0353.34 × 10-54.48
0.06400.0363.20 × 10-54.49
0.06300.0373.06 × 10-54.51
0.06200.0382.94 × 10-54.53
0.06100.0392.82 × 10-54.55
0.06000.0402.70 × 10-54.57
0.05900.0412.59 × 10-54.59
0.05800.0422.49 × 10-54.60
0.05700.0432.39 × 10-54.62
0.05600.0442.29 × 10-54.64
0.05500.0452.20 × 10-54.66
0.05400.0462.11 × 10-54.68
0.05300.0472.03 × 10-54.69
0.05200.0481.95 × 10-54.71
0.05100.0491.87 × 10-54.73
0.05000.0501.80 × 10-54.74
0.04900.0511.73 × 10-54.76
0.04800.0521.66 × 10-54.78
0.04700.0531.60 × 10-54.80
0.04600.0541.53 × 10-54.81
0.04500.0551.47 × 10-54.83
0.04400.0561.41 × 10-54.85
0.04300.0571.36 × 10-54.87
0.04200.0581.30 × 10-54.88
0.04100.0591.25 × 10-54.90
0.04000.0601.20 × 10-54.92
0.03900.0611.15 × 10-54.94
0.03800.0621.10 × 10-54.96
0.03700.0631.06 × 10-54.98
0.03600.0641.01 × 10-54.99
0.03500.0659.69 × 10-65.01
0.03400.0669.27 × 10-65.03
0.03300.0678.87 × 10-65.05
0.03200.0688.47 × 10-65.07
0.03100.0698.09 × 10-65.09
0.03000.0707.71 × 10-65.11
0.02900.0717.35 × 10-65.13
0.02800.0727.00 × 10-65.15
0.02700.0736.66 × 10-65.18
0.02600.0746.32 × 10-65.20
0.02500.0756.00 × 10-65.22
0.02400.0765.68 × 10-65.25
0.02300.0775.38 × 10-65.27
0.02200.0785.08 × 10-65.29
0.02100.0794.78 × 10-65.32
0.02000.0804.50 × 10-65.35
0.01900.0814.22 × 10-65.37
0.01800.0823.95 × 10-65.40
0.01700.0833.69 × 10-65.43
0.01600.0843.43 × 10-65.46
0.01500.0853.18 × 10-65.50
0.01400.0862.93 × 10-65.53
0.01300.0872.69 × 10-65.57
0.01200.0882.45 × 10-65.61
0.01100.0892.22 × 10-65.65
0.01000.0902.00 × 10-65.70
0.00900.0911.78 × 10-65.75
0.00800.0921.57 × 10-65.81
0.00700.0931.35 × 10-65.87
0.00600.0941.15 × 10-65.94
0.00500.0959.47 × 10-76.02
0.00400.0967.50 × 10-76.12
0.00300.0975.57 × 10-76.25
0.00200.0983.67 × 10-76.43
0.00100.0991.82 × 10-76.74
1.34 × 10-90.1001.34 × 10-98.87
[HA][OH–][H+]pH
5.56 × 10-80.0011.00 × 10-1111.00
2.78 × 10-80.0025.00 × 10-1211.30
1.85 × 10-80.0033.33 × 10-1211.48
1.39 × 10-80.0042.50 × 10-1211.60
1.11 × 10-80.0052.00 × 10-1211.70
9.26 × 10-90.0061.67 × 10-1211.78
7.94 × 10-90.0071.43 × 10-1211.85
6.94 × 10-90.0081.25 × 10-1211.90
6.17 × 10-90.0091.11 × 10-1211.95
5.56 × 10-90.0101.00 × 10-1212.00
5.05 × 10-90.0119.09 × 10-1312.04
4.63 × 10-90.0128.33 × 10-1312.08
4.27 × 10-90.0137.69 × 10-1312.11
3.97 × 10-90.0147.14 × 10-1312.15
3.70 × 10-90.0156.67 × 10-1312.18
3.47 × 10-90.0166.25 × 10-1312.20
3.27 × 10-90.0175.88 × 10-1312.23
3.09 × 10-90.0185.56 × 10-1312.26
2.92 × 10-90.0195.26 × 10-1312.28
2.78 × 10-90.0205.00 × 10-1312.30
2.65 × 10-90.0214.76 × 10-1312.32
2.53 × 10-90.0224.55 × 10-1312.34
2.42 × 10-90.0234.35 × 10-1312.36
2.31 × 10-90.0244.17 × 10-1312.38
2.22 × 10-90.0254.00 × 10-1312.40
2.14 × 10-90.0263.85 × 10-1312.41
2.06 × 10-90.0273.70 × 10-1312.43
1.98 × 10-90.0283.57 × 10-1312.45
1.92 × 10-90.0293.45 × 10-1312.46
1.85 × 10-90.0303.33 × 10-1312.48
1.79 × 10-90.0313.23 × 10-1312.49
1.74 × 10-90.0323.12 × 10-1312.51
1.68 × 10-90.0333.03 × 10-1312.52
1.63 × 10-90.0342.94 × 10-1312.53
1.59 × 10-90.0352.86 × 10-1312.54
1.54 × 10-90.0362.78 × 10-1312.56
1.50 × 10-90.0372.70 × 10-1312.57
1.46 × 10-90.0382.63 × 10-1312.58
1.42 × 10-90.0392.56 × 10-1312.59
1.39 × 10-90.0402.50 × 10-1312.60
1.36 × 10-90.0412.44 × 10-1312.61
1.32 × 10-90.0422.38 × 10-1312.62
1.29 × 10-90.0432.33 × 10-1312.63
1.26 × 10-90.0442.27 × 10-1312.64
1.23 × 10-90.0452.22 × 10-1312.65
1.21 × 10-90.0462.17 × 10-1312.66
1.18 × 10-90.0472.13 × 10-1312.67
1.16 × 10-90.0482.08 × 10-1312.68
1.13 × 10-90.0492.04 × 10-1312.69
1.11 × 10-90.0502.00 × 10-1312.70