I am a novice in this field and wonder if there's more satisfying answers to explain the low conductivity of Tris in pH7-8 aqueous solution. The equation of pH = pKa + log(conc of base/conc. of acid form) shows ~87% of ionization at pH7.2.
If low ion mobility is a factor, is there some guidelines to how molecular properties (e.g. M.W.) affect ion mobility?
Thank you all in advance for your input.
Shen-Ming Chen
You can use the Stokes-Einstein relation to estimate the mobility of an ion in terms of the viscosity of the solvent (water). This means the mobility scales inversely with the "hydrodynamic radii" of the diffusing particle.
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