#1
Q: 20.00 mL of 0.0532 M KBr was titrated with 0.0511 M AgNO3. Calculate pAg+ at the following volumes of AgNO3 added:
a) 20 mL
b) equivalence point
c) 22.60 mL
Ksp of AgBr is 5.0 x 10-13. So I'm assuming the question is asking for the % moles of individual Ag+ ions are in the solution with the Ksp of AgBr considered.
#2
Q: taking into account the true activities, calculate concentration of Tl+ in a saturated solution of TlBr in water (Ksp = 3.6x10-6). (you will have to approximate the concentration of the ions before calculating activity coefficient)
Rough concentration based on Ksp is 0.0019M for Tl+ and Br-
ionic strength = (0.5)(0.0019*12+0.0019*12) = ~0.002 M
activity coefficient = 10-0.509(12+12)(0.002)1/2 = 0.949
now i'm stuck