A figure expressing the acidity or alkalinity of a solution of a weak electrolyte in a similar way to pH, equal to −log10 K, where K is the dissociation (or ionization) constant of the electrolyte.
- The average experimental residue pKs are slightly stabilized relative to what is found in small peptides with a modest standard deviation.
- In the yeast variant, the apparent pK of the alkaline transition is an intermediate value between the pKs of two ionizations.
- With SCCE 40% of the pKs are in error by this amount and 7% have errors greater than 4 pH units.
From p as in pH, and K representing a constant.