Insolubility refers to the inability of a substance to dissolve in a particular solvent. This can apply to:
* Solids: Many solids are insoluble in common solvents like water (e.g., sand, oil).
* Liquids: Some liquids are insoluble in others (e.g., oil and water).
* Gases: Certain gases are insoluble in liquids (e.g., nitrogen in water).
Key Point: The state of matter (solid, liquid, or gas) does not determine if a substance is soluble or insoluble. It depends on the interaction between the substance and the solvent.
For example, while salt (NaCl) is a solid that is soluble in water, oil (a liquid) is insoluble in water.
