PIPES

Useful Range
pKa1 pH 6.10 - 7.50
Note

Can form radicals

Wikipedia Entry
pKa vs. Temperature
0°C 4°C 20°C 25°C 37°C
pKa1 7.02 6.94 6.80 6.76 6.66
d(pKa1)/dT
-0.0085