What is the concentration of a solution?

Study for the Medical Chemistry Test. Explore multiple choice questions with hints and explanations. Get exam-ready with engaging quizzes and comprehensive study materials.

Concentration is a measure of how much solute is present relative to the amount of solvent (or to the overall solution). The best choice captures this idea by expressing concentration as the proportion of solute to solvent in a mixture. This framing emphasizes the relationship between how much solute there is and how much solvent surrounds it, which is what concentration means in chemistry.

The other ideas are more limited: counting the total number of solute particles ignores how much solvent is involved; using the ratio of solvent to solute by volume gives the inverse relationship and isn’t the general sense of concentration; and stating mass per liter of solution describes a specific way to express concentration, but not the broader concept of the solute–solvent proportion.