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Ksp is the solubility product equilibrium constant. To write the Ksp expression, first you need to write an equation where ionic solid is on the reactant side and aqueous ions it dissociates into are on the product side. Ni3(PO4)2 dissociates into 3 Ni2+(aq) ions and two PO43-(aq) ions.
Ni3(PO4)2(s)⇋ 3Ni2+(aq) + 2PO43-(aq)

Next, K is equal to the concentration of products to the power of their coefficients over the concentration of reactants to the power of their coefficients. However, solids and liquids are NOT a part of the equilibrium expression. Therefore, Ksp expression will only include products.
Ksp = [Ni2+]3[PO43-]2

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