Why don't all solids dissolve?

Not all solids dissolve in a solvent due to differences in molecular interactions. Solubility depends on the balance between the attraction of solvent molecules to the solute and the forces holding the solute's particles together. If the solvent cannot effectively break these forces, the solid will remain undissolved. Additionally, the chemical composition and structure of the solid play a significant role in its solubility in a given solvent.