Homogeneous Mixture
Definition and meaning of Homogeneous Mixture in chemistry.
A homogeneous mixture is a mixture in which two or more substances are combined so uniformly that the composition and properties are the same throughout the sample.
In more detail
Because the components are mixed at the particle level, a homogeneous mixture appears as a single visible phase, even though more than one substance is present. Solutions are the most common example: a solute disperses uniformly through a solvent so that any portion taken has the same concentration as any other. No chemical bonds form between the components, so a homogeneous mixture retains the individual properties of its constituents and can be separated by physical means such as distillation, evaporation, or chromatography. Uniformity holds down to a very fine scale, but on close inspection the mixture still consists of distinct chemical substances rather than a new compound.
Key facts
| Field | General Chemistry |
|---|---|
| Common type | Solution (e.g., saltwater, NaCl in H2O) |
| Number of visible phases | One |
| Separation methods | Distillation, evaporation, chromatography (physical, not chemical) |
Salt water (NaCl dissolved in H2O) is a homogeneous mixture: every sample drawn from it has the same clear appearance and the same salt concentration.
Frequently asked questions
How is a homogeneous mixture different from a heterogeneous mixture?
A homogeneous mixture has uniform composition and a single visible phase throughout, while a heterogeneous mixture has visibly distinct regions or phases with differing composition, such as oil and water or sand in water.
Is air a homogeneous mixture?
Yes. Air is a homogeneous mixture of gases, mainly nitrogen, oxygen, argon, and carbon dioxide, uniformly mixed so that any sample of it has the same composition.