Kinetics of the dissolution of copper(II) oxychloride in diluted aqueous hydrochloric acid solutions at different temperatures

The dissolution kinetics of copper(II) oxychloride in a diluted hydrochlori c acid solution at different temperatures was studied. The progress of the dissolution was followed by tracking changes of pH of the solution. The kin etic parameters of the early stage of a dissolution reaction, the Arrhenius pre-exponential factor and the activation energy, were estimated. The valu es were 6.7 x 10(6) mol m(-2) s(-1) and 71 +/- 10 kJ/mol, respectively, ind icating the surface-controlled kinetics. The model in which the rate of dis solution was determined by the distance of the system from equilibrium was used to interpret the dissolution process. An agreement between the experim ental and the calculated values of the H+ ion concentration as a function o f time was obtained.