Final answer:
When you dilute a solution, the number of moles of the solute does not change.
Step-by-step explanation:
When you dilute a solution, the number of moles of the solute does not change. Dilution involves adding more solvent, typically water, to a given volume of a solution. This increases the total volume and decreases the concentration of the solution, but the number of moles of the solute remains constant.