Which of the following actions will decrease the concentration of a solution?

• A. Removing some solute from the solution
• B. Adding more solute to the solution
• C. Evaporating some of the solvent from the solution
• D. Adding more solvent to the solution

Answer: (D)

Verified step by step guidance

1. Understand that concentration is defined as the amount of solute divided by the volume of the solution, often expressed as \(\text{concentration} = \frac{\text{moles of solute}}{\text{volume of solution}}\).
2. Analyze the effect of removing some solute: since the amount of solute decreases while the volume remains roughly the same, the concentration decreases.
3. Analyze the effect of adding more solute: the amount of solute increases while the volume remains roughly the same, so the concentration increases.
4. Analyze the effect of evaporating some solvent: the volume of the solution decreases while the amount of solute remains the same, so the concentration increases.
5. Analyze the effect of adding more solvent: the volume of the solution increases while the amount of solute remains the same, so the concentration decreases.