Vernier Software and Technology
Vernier Software & Technology

Killer Cup of Coffee

Figure from experiment 9 from Forensics with Vernier


SOUTH PAINTER, Tuesday: It was a normal Monday morning at GlobalTech Industries until the mail boy discovered project manager Patrick Marchand dead in his cubicle, head on his desk. Mr. Marchand had died while writing an email, in a room full of people hard at work. An early examination of the crime scene yielded no clues.

Mr. Marchand was known to have a serious heart condition, and many signs pointed to cardiac arrest as the cause of his death. However, as police canvassed the office space, the distinct odor of bitter almonds was detected, and a vial containing a small amount of an unknown chemical was found discarded in a communal trash can.


  • Use Beer's law to determine the concentration of simulated iron(III) thiocyanate (FeSCN2+) in an unknown solution.
  • Use colorimetry to determine the concentration of a colored species in a solution.
  • Use a linear relationship to model the data (Beer's law).
  • Learn the importance of carefully prepared standards.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Forensics with Vernier

See other experiments from the lab book.

1Tracks of a Killer
2Bouncing Back
3Name That Tune
4Making Cents of Math: Linear Relationship between Weight and Quantity
5The Ink is Still Wet
6Speeding Up
7Drug Tests
8No Dumping
9Killer Cup of Coffee
10Dropped at the Scene
11Ashes to Ashes
12Hit and Run
13Life in the Fast Lane
14Chill Out: How Hot Objects Cool

Experiment 9 from Forensics with Vernier Lab Book

<em>Forensics with Vernier</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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