Beer's Law simulation


Discover Beer's law using this interactive simulation. Investigate concentration and test the transmission and absorption of light with different solutions.

Type of Activity

group work, working independently



Age Group

16 to 18 years


This resource has been provided by, or developed in partnership with, PhET Interactive Simulations, University of Colorado Boulder

Beer's law laboratory simulation, developed by PhET, University of Colorado Boulder. Select 'Beer's Law' or 'Concentration' when the tool launches. Click the PhET logo in the resource for more information.


PhET sims are fun, interactive, research-based simulations of physical phenomena developed by the PhET™ project at the University of Colorado. Conversion to HTML5 and tablet compatibility supported by the Royal Society of Chemistry.

Sample Learning Goals:

  • Describe the relationships between volume and amount of solute to solution concentration.
  • Explain qualitatively the relationship between solution color and concentration.
  • Predict and explain how solution concentration will change for adding or removing: water, solute, and/or solution.
  • Calculate the concentration of solutions in units of molarity (mol/L).
  • Design a procedure for creating a solution of a given concentration.
  • Identify when a solution is saturated and predict how concentration will change for adding or removing: water, solute, and/or solution.
  • Describe the relationship between the solution concentration and the intensity of light that is absorbed/transmitted.
  • Describe the relationship between absorbance, molar absorptivity, path length, and concentration in Beer’s Law.
  • Predict how the intensity of light absorbed/transmitted will change with changes in solution type, solution concentration, container width, or light source, and explain why.