What does concentration measure in a solution?

• A. The temperature of the solvent.
• B. The total volume of the solution.
• C. The color of the solution.
• D. The amount of solute dissolved in the solvent.

Answer: (D)

Concentration measures how much solute is dissolved in the solvent. It tells you how “strong” or dense a solution is in terms of the amount of dissolved substance present for a given amount of solvent (or solution). It is not about the solvent’s temperature, nor simply the total volume, nor the color of the solution. In practice, concentration can be expressed in different ways, such as grams of solute per grams of solvent or moles per liter, and it changes when you add more solute or dilute with more solvent.