Solubility product Ksp (Ksp = [M]ˣ[X]ʸ for sparingly soluble salt)

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Ksp = [M]ˣ[X]ʸ for sparingly soluble salt

What each symbol means

SymbolWhat it stands for
sMolar solubility related via stoichiometry
K_spEquilibrium constant for dissolution (solid omitted)

When to use this

Saturated solution at constant T; activities ≈ concentrations for dilute ions; common ion reduces s but Ksp unchanged (same T).