Final answer:
Concentration describes the amount of solute in a given amount of solvent, measured in units like mol-dm³, and indicates whether a solution is dilute or concentrated.
Step-by-step explanation:
Concentration is defined as the quantity of a solute that is dissolved in a certain quantity of solvent or solution. This is often measured in units like mol-dm³, and it can describe how dilute or how concentrated a solution is. For instance, vinegar with 5% acetic acid is a less concentrated solution than one with 10% acetic acid. The concept of concentration is crucial in chemistry as it helps in controlling the stoichiometry of reactants in solution reactions. Moreover, concentration can also be expressed through different ratios, such as mass percentage or parts per million (ppm).