Several works have demonstrated the utility of thermodynamics for understanding the formation process of ZnO in a specific ambient. In this work, equilibrium relations, mass balances and charge balances were used to derive chemical stability and predominance diagrams that allow relating the experimental observations of the synthesis of zinc oxide in methanol by the precipitation method to the expected product composition. The proposed equilibrium model considers the formation of zinc complexes with acetate (OAc-) and hydroxide (OH-) ions. Zinc oxide was also synthesized in similar conditions as those employed for calculations. The reaction monitoring was carried out by measuring pH and it was compared with the pH estimated using the model. Structural characterization of the product by X ray diffraction and scanning electron microscopy was performed. The proposed model predicts the formation of zinc oxide as the only species in the solid state, which agrees with the experimental results.
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