Final answer:
The molarity of a solution will remain the same when it is drained because only the solvent is removed, not the solute. The amount of solute stays constant; only the volume changes.
Step-by-step explanation:
When you drain a solution, assuming no solute is removed with the solvent, the molarity of the solution will remain the same. Molarity is defined as the number of moles of solute per liter of solution. Since draining a solution typically means removing the solvent without removing the solute, the number of moles of solute in the solution doesn't change; only the volume of the solution is reduced. Thus, the concentration of the solution, or molarity, will not change and the correct answer is (c) Molarity will remain the same.
When dealing with the molarity of a solution, it's crucial to understand that dilution and concentration processes do not alter the amount of solute present. Whenever you dilute or concentrate a solution, the solute amount remains unchanged; what changes is the volume of the solution. The molarity can be recalculated if needed based on the new volume using the formula moles of solute (moles) / volume of solution (liters) = molarity (M).