Question

1 if a student wants to decrease the concentration of an aqueous solution, what should be done? a the student should add more solvent to the solution b the student should add more solute to the solution c the student should agitate the solution d the student should decrease the surface area of the solution

Explanation:

The concentration of a solution is calculated as $\frac{\text{amount of solute}}{\text{amount of solution (solute + solvent)}}$. Adding more solvent increases the denominator (amount of solution) while the numerator (amount of solute) remains the same, thus decreasing the concentration. Adding more solute would increase the concentration. Agitating the solution affects the rate of dissolution (if there was undissolved solute initially) but not the concentration of the already - formed solution. Decreasing the surface area of the solution has no direct impact on the concentration formula.

Answer:

A. The student should add more solvent to the solution