Soluble substances are those that can dissolve in a solvent, usually water, to form a homogeneous mixture called a solution.
Examples:
1. Sugar: When you add sugar to water, it dissolves completely, forming a sweet solution.
2. Salt: Table salt (NaCl) readily dissolves in water, forming a salty solution.
Insoluble substances are those that do not dissolve in a solvent, even when stirred or shaken. They will settle to the bottom of the container, forming a heterogeneous mixture called a suspension.
Examples:
1. Sand: Sand is made up of tiny rock particles that do not dissolve in water.
2. Oil: Oil and water do not mix. Oil will float on top of water and will not dissolve.
Key takeaway: Solubility depends on the properties of both the solute and the solvent. Some substances are soluble in water, while others are not.
