Which term indicates the concentration change resulting from dilution with solvent?

• A. Dilution
• B. Concentration
• C. Molarity
• D. Titration

Answer: (A)

When you add solvent to a solution, the concentration decreases. The change in concentration caused by diluting with solvent is called dilution. In dilution, the amount of solute stays the same while the volume increases, so the concentration (moles per liter) drops, following the relation M1V1 = M2V2.

That’s why dilution is the best term here: it specifically describes the reduction in concentration due to adding solvent. Concentration, on the other hand, is just the measure of how much solute is present per volume, not the change itself; molarity is a way of expressing concentration, not the process; and titration is a procedure used to determine concentration, not the dilution effect.