Abstract
Correlations relating the specific chemical rate for the acid dissolution of MgO, Mg 2SiO 4, ZnO, Zn 2SiO 4 and ZnFe 2O 4 to temperature and hydrogen ion concentration/activity have been produced from a critical analysis of published dissolution data. In determining specific chemical rates it is important that consideration is given to the means of determination of the surface area of the solid and to the likelihood of a diffusional resistance contributing to the dissolution rate. It is demonstrated that at 25°C, the chemical dissolution rates of the silicates are significantly lower than those of the corresponding oxides. This finding is discussed in terms of current theories of the oxide dissolution process.
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