"Like dissolves like" is a general rule in solubility.
Water is a polar molecule. Its structure is not symmetric, and there is polarity between its elements that compose it - the electronegativity difference between H and O is significantly large.
Ionic molecules are the same. the elements composing it experience polarity, and they aren't symmetric in structure.
Hexane is a nonpolar molecule, and it has a symmetric structure. Since like dissolves like, hexane won't dissolve ionic materials.
hope this helps? `u`
Why do ionic materials dissolve so well in water, but not in Hexane?
2 answers
Ionic materials are polar. Water is a polar solvent. Hexane is a non-polar solvent.