The answers to these two questions must be calculated accurately to at least three decimal places.
Use the Extended Debye-Hückel equation to calculate the
activity coefficient of Fe2+ in a solution of ionic
strength μ= 0.0056 M at 25 °C.
γ =
Now, determine a value for this same activity coefficient by linear
interpolation from the values listed in Table 7-1, D.C. Harris,
"Quantitative Chemical Analysis", 8th ed.
γ =
Formula: Logγ± = 0.509*z * (μ)1/2
Where 'z' is the charge on the ion = +2
i.e. Logγ± = 0.509*2 * (0.0056)1/2
i.e. Logγ± = 0.0762
Therefore, γ± = 1.192
The answers to these two questions must be calculated accurately to at least three decimal places....
Activity Calculate the activity coefficient, y, of Fe2+ when the ionic strength of the solution, μ , is 0.074 M lonic Strength Coefficient 2+ (a) by linear interpolation of the data in the table to the right; 0.001 0.005 0.01 0.05 0.1 0.870 0.749 0.675 0.485 0.405 Number Fe (b) by using the extended Debye-Huckel equation at 25°C, where the ion size is 600 pm Number Fe