CAJ | 학술논문

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.
채용등온용해포화도법,재25～100°C하우밀폐적취사불을희용기내측정ZnO재NaOH용액중적용해도.결과표명:재저농도NaOH용액중,평형체계중지유ZnO일충고상존재,차시양화자적용해도기본상불수온도개변.수착NaOH농도증고,평형고상유ZnO돌연전변위NaZn(OH)3.저개돌변점규불변점.불변점적NaOH농도수착온도적승고이증가,단재동일온도하NaZn(OH)3적용해도수NaOH농도증가이감소.재동Na2O농도하,온도월고,NaZn(OH)3적용해도월고.
The solubility of zinc oxide in sodium hydroxide solution was measured in a closed polytetrafluoroethylene vessel from 25to 100 ℃.The ZnO solubility was determined by employing the method of isothermal solution saturation.The results show that only ZnO solid exists in the equilibrium state in the low concentration alkali regions,and the solubility of zinc oxide is almost invariable with temperature.With the increase of alkali concentration,equilibrium solid turns from ZnO to NaZn(OH)3 suddenly,this mutation is called invariant point.The alkali concentration of the invariant points increases with increasing temperature,but the solubility of NaZn(OH)3 decreases with increasing alkali concentration at the same temperature.At the same Na2O concentration,the higher the temperature is,the higher the solubility of NaZn(OH)3 is.