Mean activity coefficient sulfate salt

EXAMPLE 2-1 Using the DHLL, calculate the activity coefiScients of each of the ions and the mean activity coefficient of the salt in a 10 m solution of potassium sulfate. 

Figure 2. The Henry constant of oxygen in aqueous solutions of sodium sulfate at 25 °C (O) experimental data (a) the Henry constant calculated with eq 24 using for the mean activity coefficient of dissolved salt the Debye-Hiickel equation (b) the Henry constant calculated with eq 24 using for the mean activity coefficient of dissolved salt the extended Debye-Hiickel equation (c) the Henry constant calculated with eq 24 using for the mean activity coefficient of dissolved salt the Bromley equation (d) the Henry constant calculated with eq 15.

Fig. 4. Activity coefficients of univalent small ions in the presence of added simple salt. The solid lines are the limiting laws for (top to bottom) the co-ion activity coefficient 72, the counterion activity coefficient yi, and the square of the mean activity coefficient y y2. The curves are drawn for = 1.85. The dashed line is the additivity rule for yi and 7172 the additivity rule for 72 coincides with the top baseline 72 = 1. The data points are measurements of 7ci (Reference [44]) for a polyvinylalcohol sulfate sample of degree of substitution corresponding to = 1.85 and NaCl concentration 1 x lO" M.

Similarly, the same method and the same mean salt furnish values of individual ionic activity coefficients for other ions—e.g., the sulfate group SO " ... 

Davies CW (1938) The extent of dissociation of salts in water. VIII. An equation for the mean ionic activity coefficient of an electrolyte in water, and a revision of the dissociation constant of some sulfates.- Jour.Chem.Soc. pp.2093-2098... 

The Mean Molal Activity Coefficient Calculation for the Macro-Component Salts. The mean molal activity coefficients for the macro-component chloride and sulfate salts are given in Figures 2a and 2b, respectively. Because of the unavailability of measured activity coefficient data in brines, validation of the results presented in Figures 2a and 2b was not possible. 

---