What is the PH of a Halamid solution?

pH measured in a solution at 22 °C

concentration (%) pH at 22oC
10 9.38
5 9.03
1 7.68
0.5 7.46
0.1 7.27
0.05 7.27
0.01 7.27
0.005 7.28
0.001 7.28
Water 7.27