The reactions and equilibrium relationships underlying the absorption process of CO2 gas in ammoniated brine solutions as proposed in part 1 are described first. A numerical solution of a set of nonlinear equations developed in the form of an algorithm, to calculate the concentration of unreacted ammonia, is obtained next. Calculated values are compared with experimental data for the system under investigation. The instantaneous absorption rate is evaluated by using the approximate approach (film model) and the exact solution (penetration theory).