Activities

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- Lesson Files
- Teacher Notes Appendix A PDF
- Teacher Notes Appendix B PDF
- Teacher Notes PDF
Alignment
- Standards Alignment
- Textbook Alignment
Subject Area
- Math: Geometry: Points, Lines and Angles
- Science: Chemistry: Stoichiometry and Mole
- Science: Chemistry: Solutions
- Science: Forensics: Data Analysis
Author

Texas Instruments
Level

9-12
Activity Time

60 Minutes
Device
- TI-84 series
Software

TI Connect™
Applications
- EasyData® for TI-83 Plus and TI-84 Plus
- Vernier EasyData™ for TI-84 Plus CE
Other Materials
- Vernier EasyLink™
- Colorimeter
- 7 cuvettes
- Colored wax pencils
- Deionized or distilled water
- 50 mL of 0.15M ferrous thiocyanate solution
- 5 mL of ferrous thiocyanate solution with unknown concentration
- Two 10 mL pipettes or graduated cylinders
- Two 50 mL beakers
- 5 stirring rods
- 2 droppers
- 5 test tubes
- Test tube rack
- Lint-free tissues
- Waste beaker
- Goggles
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Forensics Case 9 - Killer Cup of Coffee: Using colorimetry to determine concentration of a poison

Activity Overview

In this activity, students will use colorimetry to determine the concentration of a colored species in a solution and use a linear relationship to model Beer's law. They use Beer's law to determine the concentration of iron(III)thiocyanate (FeSCN²⁺) in an unknown solution.

Key Steps

With the colorimeter, students create a graph of the absorbance of known concentrations to find the concentration of FeSCN²⁺ in an unknown solution.
After the graph of the data is created, the linear regression is used to find the predicted concentration of the unknown poison.

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Lesson Files

Alignment

Subject Area

Author

Level

Activity Time

Device

Software

Applications

EasyData® for TI-83 Plus and TI-84 Plus

Vernier EasyData™ for TI-84 Plus CE

Other Materials

Report an Issue

Forensics Case 9 - Killer Cup of Coffee: Using colorimetry to determine concentration of a poison

Activity Overview

Key Steps

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