One can change the concentration of a solution while keeping the number of moles of solute the same by reducing the volume of solvent in the solution.
The molarity of a solution is the number of moles of solute per unit volume of solvent.
The number of moles of solute in a unit volume of solvent can be kept constant while the volume of the solvent reduced in order to increase the concentration of a solution.
For example, a solution with 2 moles of solute in 1 L of solvent will have a molarity of 2 M.
If the amount of solvent is reduced to 0.5 L, the molarity will become:
2/0.5 = 4 M
More on molarity can be found here: https://brainly.com/question/12127540
