The Weak acid node supports multiple dissociation steps, where the acid of the first dissociation step is uncharged.

The species can be either Monoprotic, subject to one dissociation step only, or Polyprotic. For the latter case, any positive integer larger than one can be used to define the Number of dissociation steps.

See also Common Settings for the Species Nodes in the Electrophoretic Transport Interface and Diffusion and Migration Settings.