$$K_{sp}$$ for $$AB_{2}$$ type salt (e.g., $$CaF_{2}$$)

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$$K_{sp} = 4 \cdot S^3$$

Concept: Simplified solubility product equation for a salt that yields one cation and two anions upon dissolution.

Notation:

  • $$K_{sp}$$ = Solubility product constant;
  • $$S$$ = Molar solubility.
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