Which of the following is the correct expression to calculate the molar solubility of Ag3PO₄ in water at 25 °C if Ksp = 2.6 í— 10-18?
1) Ag3PO₄ = √(Ksp)
2) Ag3PO₄ = Ksp
3) Ag3PO₄ = 1/Ksp
4) Ag3PO₄ = 1/ √(Ksp)