Determine the amount of solute
Determine the amount of solution or solvent
Choose the concentration unit
Use the appropriate formula
Molarity = moles of solute / liters of solution
Molality = moles of solute / kilograms of solvent
Mass percent = (mass of solute / mass of solution) × 100
Volume percent = (volume of solute / volume of solution) × 100
Parts per million = (mass of solute / mass of solution) × 10^6
Parts per billion = (mass of solute / mass of solution) × 10^9
Substitute the measured values into the formula
Calculate the concentration
Include the correct units
Convert units if needed before calculating