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

by Texas Instruments

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.

Related Activities

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Forensics Case 5 - The Ink Is Still Wet: Using colorimetry to identify an unknown ink
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Alignment

Device

Software

Applications

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

Vernier EasyData™ for TI-84 Plus CE

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

Overview

Key Steps

Related Activities

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