What is the primary characteristic of a true solution?

A true solution is primarily characterized as a homogeneous mixture. This means that when the solute is dissolved in the solvent, the resulting solution has a uniform composition throughout. The particles of the solute are not visible to the naked eye and do not settle out over time, indicating that they are completely integrated at the molecular level.

In contrast to a true solution, mixtures that contain suspended particles are not homogeneous. These can include colloids or suspensions where larger particles are dispersed but may eventually separate from the solution. The visibility of particles or their tendency to settle out over time indicates that the mixture is not a true solution, as a true solution retains a consistent look and composition even after sitting undisturbed. Therefore, the defining characteristic of a true solution is its homogeneous nature.