# pI undefined # pH chg 0.00 -0.00 0.50 -0.00 1.00 -0.00 1.50 -0.01 2.00 -0.03 2.50 -0.09 3.00 -0.25 3.50 -0.51 4.00 -0.77 4.50 -0.91 5.00 -0.97 5.50 -0.99 6.00 -1.00 6.50 -1.00 7.00 -1.00 7.50 -1.00 8.00 -1.00 8.50 -1.00 9.00 -1.00 9.50 -1.01 10.00 -1.03 10.50 -1.08 11.00 -1.23 11.50 -1.52 12.00 -1.91 12.50 -2.33 13.00 -2.70 13.50 -2.97 14.00 -3.21