What is the value of Ksp for Ag2SO4 obtained with these data?

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What is the value of Ksp for Ag2SO4 obtained with these data?

Answer:

Ag2SO4=2Ag+ +SO4²–

S=solubility of. Ag2SO4

[Ag+]=2S
[SO4²-]=S

Ksp=[Ag+]²[SO4]²-=(2S)²(S)=4S³