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Investigating the Purity of a Mixture

Experiment #7 from Vernier Chemistry Investigations for Use with AP* Chemistry

Education Level
High School


Determining the purity of mixture can offer a chemist a number of options. Choosing the best process among the possibilities often involves considering factors such as complexity of the process, safety and handling, cost, and disposal of waste. In this investigation, you will practice various methods of testing a mixture. A major consideration in the testing, analysis, evaluation, and recommendation will be the principles of the laboratory concept known as Green Chemistry.

What is Green Chemistry? The U.S. Environmental Protection Agency (EPA) describes the mission of Green Chemistry as the design of chemical processes and products in a way that reduces and/or eliminates the production of substances that are hazardous to humans, animals, and the environment.


The objective of this investigation is to determine the amount of each substance in the mixture. There are many ways to accomplish this objective, three of which will be presented in the Initial Investigation.

In addition, you will evaluate the three methods of testing, with regard to accuracy, ease of operation, and the principles of Green Chemistry in order to recommend one method.

Sensors and Equipment

This experiment features the following sensors and equipment. Additional equipment may be required.

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This experiment is #7 of Vernier Chemistry Investigations for Use with AP* Chemistry. The experiment in the book includes student instructions as well as instructor information for set up, helpful hints, and sample graphs and data.

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