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采用等温溶解饱和度法,在25～100°C下于密闭的聚四氟乙烯容器内测定ZnO在NaOH溶液中的溶解度。结果表明:在低浓度NaOH溶液中,平衡体系中只有ZnO一种固相存在,此时氧化锌的溶解度基本上不随温度改变。随着NaOH浓度增高,平衡固相由ZnO突然转变为NaZn(OH)3。这个突变点叫不变点。不变点的NaOH浓度随着温度的升高而增加,但在同一温度下NaZn(OH)3的溶解度随NaOH浓度增加而减少。在同Na2O浓度下,温度越高,NaZn(OH)3的溶解度越高。
Using isothermal dissolution of the saturation method, at 25 ~ 100 ° C in a sealed polytetrafluoroethylene container to determine the solubility of ZnO in NaOH solution. The results show that in the low concentration of NaOH solution, only ZnO has a solid phase in the equilibrium system, and the solubility of zinc oxide does not change with temperature basically. As the concentration of NaOH increases, the equilibrium solid phase changes suddenly from ZnO to NaZn (OH) 3. This mutation point is invariant. The invariant NaOH concentration increased with increasing temperature, but the solubility of NaZn (OH) 3 decreased with increasing NaOH concentration at the same temperature. At the same Na2O concentration, the higher the temperature, the higher the solubility of NaZn (OH) 3.