Which term is defined as a measure of the amount of solute in a given amount of solvent or solution?

• A. Concentration
• B. Molality
• C. Molarity
• D. Normality

Answer: (A)

Concentration describes how much solute is present relative to the amount of solvent or solution, and it’s the general way we quantify how “strong” a solution is. Because it covers solute amount in relation to either solvent or solution, it’s the broad term for this idea. In practice, there are standard ways to express it: molarity uses moles per liter of solution, molality uses moles per kilogram of solvent, and normality uses equivalents per liter of solution. The question’s wording fits this broad concept, since it’s about the amount of solute in a given amount of solvent or solution. For example, 1 mole of solute in 1 liter of solution is a 1 M solution, while 1 mole in 1 kilogram of solvent is a 1 molal solution, illustrating how the same idea adapts to different reference amounts.