Here's why:
* Dilute implies a low concentration of solute in the solvent.
* Concentrated implies a high concentration of solute in the solvent.
While "dilute" is a qualitative term, it can be used in a quantitative sense. For example, a chemist might say a solution is "very dilute" or "slightly dilute," providing a relative sense of the solute concentration.
It's important to remember that "dilute" and "concentrated" are relative terms, meaning they depend on the context and the amount of solute present.