From the Nernst and Debye Huckle equations one can get to the vAg. Here is the pKsp calculation for Bromide ion as a function of Temperature.
brpksp = -12.1258 + 5868.64 / (T + 273.15) + .015953 * (T + 273.15)
The patent is very early work, but useful. The latest was published in the 90s IIRC.