Anion-specific effects on mineral dissolution, such as the effects observed in this study, were reported for calcite , barite , dolomite and gypsum . For these minerals, the hydration step of the alkaline-earth cation is very important for their dissolution rates. It is commonly observed that increased water-cation binding strengths decrease the entropy of the dissolution process ∆S diss for the mineral and, therefore, decrease dissolution rates. If the dissolving water contains an electrolyte (such as a sodium salt like sodium chloride), the anions of this electrolyte can stabilize the hydration shell of the dissolving cation (calcium in the case of CA in our study). It is thought that the stronger the anion stabilizes the dissolving cation's hydration shell, the lower the entropy gain in dissolution and, consequently, the slower the dissolution of the mineral. Accordingly, kosmotropes lead to a smaller driving force for dissolution and thereby can contribute to either slower dissolution rates or temporary inhibition of dissolution. Besides their kosmotropic effect, it is also possible that the adsorption of the anions on the CA surface plays a critical role in inhibiting the initial CA dissolution. Anion adsorption at high-energy sites on the CA surface would reduce their energy and, therefore, the driving force to dissolution. The available data in this study does not allow for a deeper interpretation of the mech-anisms of CA dissolution inhibition but, at the same time, shows that the acids' anions represent an influencing factor.