# pI = 5.58
# pH      chg
0.00     1.00
0.50     1.00
1.00     1.00
1.50     0.99
2.00     0.98
2.50     0.95
3.00     0.85
3.50     0.65
4.00     0.37
4.50     0.15
5.00     0.05
5.50     0.01
6.00    -0.03
6.50    -0.11
7.00    -0.27
7.50    -0.55
8.00    -0.79
8.50    -0.92
9.00    -0.97
9.50    -0.99
10.00   -1.00
10.50   -1.00
11.00   -1.00
11.50   -1.00
12.00   -1.00
12.50   -1.00
13.00   -1.01
13.50   -1.03
14.00   -1.09