Question 6. Adding water to a concentrated solution: (i) changes the concentration of the solution (ii) does not change the number of moles of solute present (iii) does not change the molarity of the solution (A) i and ii (B) i and iii (C) a and iii (D) I only
The correct answer is (B) i and iii.
Adding water to a concentrated solution will change the concentration of the solution because the total volume of the solution increases. This means that the same amount of solute is now spread out over a larger volume, resulting in a lower concentration.
However, adding water does not change the number of moles of solute present in the solution. The amount of solute remains the same even though the volume changes.
Adding water also does not change the molarity of the solution. Molarity is a measure of the concentration of a solution, defined as the number of moles of solute divided by the volume of the solution in liters. Since the number of moles of solute and the volume of the solution both change by the same factor when water is added, the molarity remains unchanged.