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Beer's Law Lab
“The thicker the glass, the darker the brew, the less the light that passes through.” Make colorful concentrated and dilute solutions and explore how much light they absorb and transmit using a virtual spectrophotometer!
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Teaching Resources
Main Topics
- Beer's law
- Solutions
- Concentration
- Molarity
- Light
- Absorbance
- Transmittance
- Spectrophotometry
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
Tips for Teachers
The teacher's guide (pdf) contains tips created by the PhET team.
Teaching Ideas
| Title | Authors | Level | Type | Updated |
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Beer's Law Warm-Up
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Julia Chamberlain | HS UG-Intro |
HW | 3/28/13 |
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Concentration and Beer's Law Investigation
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Julia Chamberlain, Susan Hendrickson | UG-Intro HS |
Other HW |
3/28/13 |
| Beer의 법칙 사용지침서(User Manual) | 이화국(Wha Kuk Lee) | Other | Other | 5/1/13 |
| Beer's Law Lab: Introduction to Beer's Law | Joel Barthel | UG-Intro HS |
Lab | 2/2/13 |
You can submit your own ideas and activities.
Related Simulations
Translated Versions:
Software Requirements
| Windows | Macintosh | Linux |
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Microsoft Windows
XP/Vista/7 Sun Java 1.5.0_15 or later |
OS 10.5 or later
Sun Java 1.5.0_19 or later |
Sun Java 1.5.0_15 or later |
Credits
| Design Team | Third-party Libraries | Thanks To |
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