Step-by-step explanation:
When we dilute a solution then it means we are increasing the volume of solvent into the solution.
Therefore, there occurs a decrease in the concentration of solute.
Whereas when a solution is concentrated then it means concentration of solute is more than the concentration of solvent into the solution.
Thus, we can conclude that in a dilution, solvent is added to a given amount of a concentrated solution then there occurs a decrease in total concentration.