Answer:
increasing the amount of solvent
Explanation:
Solvent is the species which is present in larger amount as compared to solute in a solution
Dilution is reverse of increasing concentration
When we use term concentration we consider the amount of solute present in a solution.
1) When we add more solute to a solution, we increase the concentration of the solution with respect to solute.
2) When we decrease the amount of solvent in the solution we are increasing the concentration of the solute (the amount of solute per unit amount of solvent increases). So by evaporating the solvent we are decreasing the amount of solvent and thus increasing the concentration of solution.
3) when we increase the amount of solvent we are decreasing the concentration of solute per unit of solvent. It means we are diluting the solution.
4) increasing the volume of the solution means no change in concentration. As it means we are adding more of solution of the same concentration to the solution of previous concentration.