Coefficient A in Davies equation

[peterwadeuk]

Greetings good people,

I am attempting to calculate activity coefficients for aqueous reactions.

I understand that the Davies equation is the default equation for calculating the activity coefficients.

The Davies equation uses a coefficient "A" that I can't find in the database.

Is this a parameter that is embedded in the program or that is well-known?

All the best,
Peter

[dlparkhurst]

It is relatively well known as a function of temperature. Its value is about 0.51 at 25C. You can print the value with the Basic function DH_A.

[peterwadeuk]

Thank you David