When investigating a solution, which property is most commonly used to determine its concentration?

• A. Color intensity
• B. Molarity (mol/L)
• C. Boiling point
• D. Density (g/mL)

Answer: (B)

Verified step by step guidance

1. Understand that concentration of a solution refers to the amount of solute dissolved in a given volume of solvent or solution.
2. Recognize that molarity, defined as moles of solute per liter of solution, is the most common quantitative measure of concentration in chemistry.
3. Note that properties like color intensity, boiling point, and density can be related to concentration but are not direct measures; they often require calibration or additional calculations.
4. Recall the formula for molarity: \(M = \frac{\text{moles of solute}}{\text{liters of solution}}\) which directly expresses concentration.
5. Conclude that molarity is the preferred property for determining concentration because it provides a clear, standardized, and direct measurement.