How Do You Calculate pAg in Precipitation Titrimetry?

[Pruddy]

Homework Statement

Calculate the pAg after the addition of 5ml, 40ml, and 45ml of 0.05M AgNO3 to 50.00ml of 0.04M Kbr (AgBr Ksp = 5 x 10^-13)

Homework Equations

The Attempt at a Solution

when 5ml of AgNo3 is added , we have
(50 x 0.004 - 5 x 0.05)/55
= 0.0318
P(kbr) = -log 0.0318
= 1.497

The point is that I don't know when and how to calculate the Pag. I find this topic very confusing.I will be very gratefull if anyone can give me a hint on how to solve this problem. Thanks

 

[Borek]

What is the definition of pAg?

 

[Pruddy]

PAg means the P-function of Ag.

 

[Borek]

So what do you need to calculate pAg? (note the capitalization - pAg, not PAg, just like pH and not PH).