Which term refers to the maximum amount of solute that can dissolve at a given temperature?

• A. Solubility
• B. Molarity
• C. Hydration
• D. Enthalpy of Solution

Answer: (A)

The key idea is understanding what determines how much of a substance can dissolve in a solvent at a specific temperature. That maximum amount is called solubility. It represents the limit set by equilibrium between the dissolving process and the precipitation of excess solute; when the solution reaches this limit, it is saturated and any additional solute won’t dissolve. Solubility depends on temperature and is often given as grams of solute per 100 grams of solvent or as molarity at that temperature.

Molarity, by contrast, is just a concentration measure—how much solute is in a given volume of solution—not the dissolution limit. Hydration describes how solvent molecules surround solute particles. Enthalpy of solution is the energy change involved in dissolving. None of these define the maximum dissolvable amount at a temperature as solubility does.