ZnSO₄-Na₂SO₄-H₂SO₄-NaOH-H₂O계의 이온平衡
Ionic Equilibria in ZnSO₄-Na₂SO₄-H₂SO₄-NaOH-H₂O system
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초록
ZnSO4-Na2SO4-H2SO4-NaOH-H2O계에대해전해질의농도를변화시키며 25oC에서용액의 pH를측정하고, K-value 방법을이용하여이온평형을해석하였다. 물의활동도와용질의활동도계수는 Pitzer 식으로계산하였다. 평형상태에서존재하는용질들의농도와활동도계수를전해질의초기농도로부터이온평형을해석하여구할수있었다. 이온강도가 4 m정도로진한용액에서 pH 측정값과이온평형해석으로구한 pH 이론값은서로잘일치하였다. 용액의이온강도가 3.5 에서 4.3 사이의실험조건에서 Pitzer 식으로구한 ZnSO4의평균이온활동도계수는문헌에발표된값과잘일치하였다.
Abstract
For ZnSO4-Na2SO4-H2SO4-NaOH-H2O system, pH of solutions with different electrolyte concentrations was measured at 25oC and ionic equilibria were analyzed by using K-value method. Activity of water and activity coefficients of solutes were calculated by Pitzer equation. The equilibrium concentration and activity coefficients of solutes were calculated from initial experimental conditions. At high ionic strength of 4m, the pH values calculated were in good agreement with those measured. In the experimental ranges of ionic strength of solution from 3.5 to 4.3 m, the mean activity coefficient of ZnSO4 calculated agreed well with those obtained from literature.