Solubility of calcium phosphate (molecular mass M) in water is W g per 100 mL at 25 °C. Its solubility product at 25 °C will be approximately:

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Step 1 — Calcium phosphate = :

Step 2 — Convert solubility:
W g per 100 mL = W g per 0.1 L = 10W g per L

Step 3 — Calculate :

(since )

Answer: Option (2) —

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