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We use a reactive Monte Carlo simulation method and primitive model ofelectrolyte to study acid-base equilibrium that controls charge regulation incolloidal systems. The simulations are performed in a semi-grand canonicalensemble in which colloidal suspension is in contact with a reservoir of saltand strong acid. The interior of colloidal particles is modeled as a lowdielectric medium, different from the surrounding water. The effectivecolloidal charge is calculated for different number of surface acidic groups,pH, salt concentrations, and types of electrolyte. In the case of potassiumchloride the titration curves are compared with the the experimentalmeasurements obtained using potentiometric titration. A good agreement is foundbetween simulations and experiments. In the case of lithium chloride specificionic adsorption is taken into account through partial dehydration of lithiumion.

Reactive Monte Carlo Simulations for Charge Regulation of Colloidal Particles