Ion-Dipole Interactions in Aqueous Solutions

Steps:

• Water is a polar molecule with a dipole moment due to uneven charge distribution.
• Metal cations carry a positive charge in aqueous solution.
• The attraction occurs between the ion's full charge and water's partial charges.
• This defines ion-dipole interaction, the primary force hydrating ions.

Why C is correct:

• Ion-dipole interactions are electrostatic attractions between a charged ion and the dipole of a polar molecule like water, as described in intermolecular force hierarchies.

Why the others are wrong:

• A: Dipole-dipole interactions occur between two polar molecules, not involving ions.
• B: Hydrogen bonds are specific interactions between a hydrogen atom and highly electronegative atoms (N, O, F), not directly between cations and water dipoles.
• D: Ionic bonds form between oppositely charged ions in a lattice, not between ions and solvent molecules.

Final answer: C