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Which combination of factors causes the solubility of an ionic compound to increase?

1. Large dipole moment of solvent, strong ion-solvent attraction and high solvation energy
2. Small dipole moment of solvent, weak ion-solvent attraction and high solvation energy
3. Large dipole moment of solvent, strong ion-solvent attraction and low solvation energy
4. Large dipole moment of solvent, weak ion-solvent attraction and high solvation energy

Correct answer: Large dipole moment of solvent, strong ion-solvent attraction and high solvation energy

Solution

Dissolution requires overcoming lattice energy; this is aided by a polar solvent (high dipole moment) that attracts ions strongly and releases large solvation energy.

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