What is a solution in chemistry?

A solution in chemistry is defined as a homogeneous mixture of two or more substances. This means that in a solution, the individual components (solvent and solute) are evenly distributed, resulting in a consistent composition throughout. For instance, when table salt dissolves in water, it forms a solution where the salt ions are uniformly dispersed within the water molecules, making it impossible to distinguish the individual components.

In contrast, a substance that cannot be dissolved does not meet the criteria for being a solution, as solutions require the solubility of one or more components. Additionally, a solid formed from two liquids refers to a specific type of reaction known as a precipitation reaction, not a solution. Lastly, a mixture of gases that are not uniform describes a heterogeneous mixture, which lacks uniformity at a microscopic level and is distinct from the characteristics of a solution.