One way to express a concentration of a solution is by using volume/volume percent concentration. Define volume/volume percent concentration and determine the type of solutions in which it is used.

• A. Volume/volume percent concentration (v/v) % is a unit of concentration expressed as the volume of solute in milliliters dissolved in 100 mL of solution. This is used in a solution containing solute and solvent, which are liquids.
• B. Volume/volume percent concentration (v/v) % is a unit of concentration expressed as the mass of solute in grams dissolved in 100 mL of solution. This is used in a solution containing solute and solvent, which are liquids.
• C. Volume/volume percent concentration (v/v) % is a unit of concentration expressed as the mass of solute in grams dissolved in 100 g of solution. This is used in a solution containing a solid solute and a liquid solvent.
• D. Volume/volume percent concentration (v/v) % is a unit of concentration expressed as the volume of solute in milliliters dissolved in 100 g of solution. This is used in a solution containing a liquid solute and a solid solvent.

Answer: (A)