Molar parts, to calculate portions of His and HisHCl
from total His equivalents.

           (pH-pKa)
          10                            1
P_His = --------------;  P_HisHCl = ---------------
             (pH-pKa)                    (pH-pKa)
        1 + 10                      1 + 10

General formula
              / [A-] \
pH = pKa + log | ---- |
              \ [HA] /

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