Which of the following is a concise definition of solubility?

• A. The quantity of solute that dissolves in a solvent at a specified temperature.
• B. The time required for dissolution.
• C. The color of the solution.
• D. The mass of the solvent.

Answer: (A)

Solubility is the maximum amount of a substance (the solute) that can dissolve in a given amount of solvent at a specific temperature. This focuses on how much dissolves under those conditions, not how quickly it happens, what the solution looks like, or just the amount of solvent itself. Temperature matters because solubility can change with temperature, so specifying a temperature is essential. The time to dissolve describes dissolution rate, not the extent of dissolution; color describes appearance; and the mass of the solvent alone doesn’t tell how much solute can be dissolved.