A new method for the determination of ionization constants of polyprotic weak acids is presented. Based on dissociation equilibrium,mass balance and charge balance, the mathematic model is established and the non line...A new method for the determination of ionization constants of polyprotic weak acids is presented. Based on dissociation equilibrium,mass balance and charge balance, the mathematic model is established and the non linear least squares Gauss Newton method is applied to numerically solve the model equations. In order to get the concentration of hydrogen ion, the Debye Hückel equation is used to calculate its activity coefficient. The ionization constants of H 2SO 3 and H 2C 2O 4 obtained by this method are in good agreement with the literature values.展开更多
In order to predict the conductance for dilute 1 1 valent electrolyte solutions, a new conductance equation was proposed based on the Onsager and Onsagar Fuoss Chen conductance equation. It has only one parameter ...In order to predict the conductance for dilute 1 1 valent electrolyte solutions, a new conductance equation was proposed based on the Onsager and Onsagar Fuoss Chen conductance equation. It has only one parameter A , which can be obtained directly from the data of ionic limiting molar conductivity Λ ∞ m, and its expression is very simple. The new equation has been verified by the experimental molar conductivities of some single strong electrolyte and mixed electrolyte solutions at 298.15 K reported in literatures. The results are in good agreement with the experimental data. Meanwhile the ionization constants of some weak electrolyte solutions were calculated by a modified equation of this new equation, and it was also found that the calculation results are in good agreement with the data in the literature.展开更多
This article is a theoretical study about ionization equilibrium. Taking the ionization equilibrium of acetic acid in a series of MeOH-water mixtures as an example, we calculated the ionization constant Ka according t...This article is a theoretical study about ionization equilibrium. Taking the ionization equilibrium of acetic acid in a series of MeOH-water mixtures as an example, we calculated the ionization constant Ka according to the IPF theory, the Born theory and the vander Waals theory, respectively. The results indicate that the values obtained by the IPF theory are in best accordance with those from literatures. A brief discussion about the theories is given at the end.展开更多
文摘A new method for the determination of ionization constants of polyprotic weak acids is presented. Based on dissociation equilibrium,mass balance and charge balance, the mathematic model is established and the non linear least squares Gauss Newton method is applied to numerically solve the model equations. In order to get the concentration of hydrogen ion, the Debye Hückel equation is used to calculate its activity coefficient. The ionization constants of H 2SO 3 and H 2C 2O 4 obtained by this method are in good agreement with the literature values.
基金Supported by the National Natural Science Foundation of China
文摘In order to predict the conductance for dilute 1 1 valent electrolyte solutions, a new conductance equation was proposed based on the Onsager and Onsagar Fuoss Chen conductance equation. It has only one parameter A , which can be obtained directly from the data of ionic limiting molar conductivity Λ ∞ m, and its expression is very simple. The new equation has been verified by the experimental molar conductivities of some single strong electrolyte and mixed electrolyte solutions at 298.15 K reported in literatures. The results are in good agreement with the experimental data. Meanwhile the ionization constants of some weak electrolyte solutions were calculated by a modified equation of this new equation, and it was also found that the calculation results are in good agreement with the data in the literature.
文摘This article is a theoretical study about ionization equilibrium. Taking the ionization equilibrium of acetic acid in a series of MeOH-water mixtures as an example, we calculated the ionization constant Ka according to the IPF theory, the Born theory and the vander Waals theory, respectively. The results indicate that the values obtained by the IPF theory are in best accordance with those from literatures. A brief discussion about the theories is given at the end.
