- 期刊
Individual lon and Mean Activity Coefficients in NaCl, NaBr, KCl and KBr Aqueous Solutions
氯化鈉，溴化鈉，氯化鉀，及溴化鉀水溶液中個別離子之活性係數及電解質平均活性係數
摘要
The individual ionic activity coefficients of Na+,K+,Cl+, and Br- in NaCl, NaBr, KCl and KBr aqueous solutions were determined with individual ion-selective electrode (ISE) at 288.15 K, 298.15 K, 308.15 K and 318.15 K and salt concentration up to 2m. The experimental results showed that the ion activity coefficients decreased with increasing temperature. At constant temperature, the activity coefficient of Na+ varied with salt concentration and was always larger than that of the counterpart-anions in solution. While the activity coefficient of K+ decreased monotonically and was always lower than that of the counterpart-anion. The activity coefficients of the cation and anion were identical in dilute solution (＜0.01m) but different from each other at higher concentrations. The experimental ion activity coefficients were correlated with the modified Pitzer-Debye-Huckel (PDH) model (Pitzer, 1973). The mean activity coefficients of the electrolytes in aqueous solutions were calculated from individual activity coefficients and showed god agreement with the literature data.
關鍵字
無資料並列摘要
The individual ionic activity coefficients of Na+,K+,Cl+, and Br- in NaCl, NaBr, KCl and KBr aqueous solutions were determined with individual ion-selective electrode (ISE) at 288.15 K, 298.15 K, 308.15 K and 318.15 K and salt concentration up to 2m. The experimental results showed that the ion activity coefficients decreased with increasing temperature. At constant temperature, the activity coefficient of Na+ varied with salt concentration and was always larger than that of the counterpart-anions in solution. While the activity coefficient of K+ decreased monotonically and was always lower than that of the counterpart-anion. The activity coefficients of the cation and anion were identical in dilute solution (＜0.01m) but different from each other at higher concentrations. The experimental ion activity coefficients were correlated with the modified Pitzer-Debye-Huckel (PDH) model (Pitzer, 1973). The mean activity coefficients of the electrolytes in aqueous solutions were calculated from individual activity coefficients and showed god agreement with the literature data.