Consideration of enthalpic and entropic energy contributions to the relative rates of chalcopyrite dissolution in the presence of aqueous cationic impurities

•Leaching evolves from interface- to transport-controlled during dissolution.•With additives (M) the rate of dissolution: K+ > Al3+ > none > Mg2+ > Na+ > Ca2+•M–OH2 volume is inversely correlated to dissolution rate per unit ionic strength.•The relative rates are related to the entropic effect on solute hydration.•For Fe addition, this effect is convoluted with its role as an oxidant.