How Does Potassium Nitrate Affect the Solubility of Silver Bromide?

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The question is :

For AgBr at 25C, with Ksp= 5.0E-13

For KNO3 solutions:

μ=0.050
γAg+ =0.8105
γBr- =0.8227

μ=0.0100
γAg+ =0.7565
γBr- =0.7794

μ=0.150
γAg+ =0.7199
γBr- =0.7529

μ=0.200
γAg+ =0.6914
γBr- =0.7340


Find the molar solubility of AgBr in 0.100-M potassium nitrate solution

what does these stand for?
γAg
γBr
 
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γ is the activity coefficient.
 

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