Your Safer Source for Science

Since 1977


P.O. Box 219 Batavia, IL 60510

Phone 800-452-1261
Fax 866-452-1436

Thermodynamics—Enthalpy of Reaction and Hess’s Law—AP* Chemistry Classic Laboratory Kit

By: The Flinn Staff

Item #: AP8832

Price: $64.50

In the Thermodynamics—Enthalpy of Reaction & Hess’s Law Classic Lab Kit for AP* Chemistry, students verify Hess’s Law. Students gain valuable experience with the process of calorimetric determinations.

See more product details

This item can only be shipped to schools, museums and science centers

Product Details

Classic AP Requirement #13—Determination of Enthalpy Change Associated with a Reaction

Students verify Hess’s Law in this experiment. Three acid–base reactions, chosen so that the third reaction equation equals the first reaction minus the second, are measured for temperature change by calorimetry. The values of heat change and enthalpy of reaction are calculated for each of the three reactions. The reaction results are then compared to verify Hess’s Law.  

Complete for 24 students working in pairs.

Thermodynamics—Enthalpy of Reaction and Hess’s Law Inquiry Guidance and AP* Chemistry Curriculum Alignment Transition Guide available! Follow the link in Resources to find this valuable publication that lets you adapt this classic AP Chemistry experiment for guided-inquiry and correlate with the AP Chemistry curriculum framework.


Materials Included in Kit (for 24 students working in pairs): Hydrochloric acid solution, ammonium chloride solution, sodium hydroxide solution, ammonium hydroxide solution, calorimeters (nested Styrofoam® cups).
Additional Materials Required (for each lab group): Beakers, distilled or deionized water, graduated cylinders, hot plates (3–6 to share), magnetic stirrer and stir bar, digital thermometer, timer or stopwatch.

*Advanced Placement and AP are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, these products.