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Chemistry · Ionic equilibrium: Weak and strong electrolytes, ionization of electrolytes

Arrange the following in increasing order of solubility in \[ M g F_{2}, C a F_{

Arrange the following in increasing order of solubility in \( \boldsymbol{H}_{2} \boldsymbol{O} \) \[ M g F_{2}, C a F_{2}, A g F \]

  • A. \( C a F_{2}<M g F_{2}<A g F \)
  • B. \( M g F_{2}<C a F_{2}<A g F \)
  • C. \( C a F_{2}<A g F_{2}<M g F \)
  • D. None of these

Step-by-step solution

AgF is highly soluble in water due to its ionic nature and the small size of F- ion. Among MgF2 and CaF2, MgF2 is more soluble because Mg2+ has a higher hydration energy (due to smaller ionic radius) that compensates for its higher lattice energy, resulting in a larger solubility product constant (Ksp) compared to CaF2. Therefore, the increasing order of solubility is CaF2 < MgF2 < AgF.
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