Advanced Chemistry Through Inquiry Teacher Guide


Teacher manual for AP* and Advanced Chemistry labs. Has both the printed version and a flash drive with teacher tips, a PDF of teacher version and editable Word student version.

Chemical Equilibrium (Colorimeter Version)

Lab Summary

In 1901, Henry Louis Le Châtelier combined explosive hydrogen gas with nitrogen gas in an attempt to form ammonia. His efforts met with disastrous results—he almost killed his assistant. Although he abandoned the synthesis of ammonia, he had a fine career that led him to discover the principle of chemical equilibrium, now known as Le Châtelier’s Principle. This principle is used by chemical engineers to create processes that make the maximum amount of products.

How can a chemical reaction be manipulated to maximize yield (without blowing up your assistant)?


Students will manipulate variables to explore how to control the direction of a reversible chemical reaction.


The student is able to use Le Châtelier’s principle to design a set of conditions that will optimize a desired outcome, such as product yield. The student is able to connect Le Châtelier’s principle to the comparison of Q

Sensors / Equipment Used:

Advanced Chemistry Sensor


Measure pressure, temperature, pH, and conductivity with the Advanced Chemistry Sensor.

PASPORT Colorimeter Sensor


Our PASPORT Colorimeter records all 4 wavelengths simultaneously--no need to guess at wavelength to get a quality measurement.

The Associated Bundle:

Chemistry Standard Sensor Bundle


Contains the sensors and probes needed to perform all 17 experiments in the Advanced Chemistry Teacher Guide and all 25 labs in the Chemistry through Inquiry Guide.

Interface Required

This experiment may require software and an interface for data collection.