Protons (H+) and hydronium ions (H3O+) in free aqueous
solutions seem to migrate faster than other ions due to the the
Grotthuss-mechanism. Individual protons do not really migrate at
all. Instead, bonds of the hydronium ions are broken and new bonds
to other water molecules are formed, so that the individual proton
does not migrate. Rather charges are transported directly from one
water molecule to the next. This process is quicker than the
diffusion of an ion through the solution.

