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Addresses AP® Chemistry Big Idea 3 and Learning Objective 3.3. Determine the molar ratio of reactants in 2 acid-base reactions using the method of continuous variation. React acid and base in different ratios and graph the temperature changes. The volume ratio that produces the largest temperature change is the correct reaction stoichiometry. Students design a procedure to collect data, plot data, calculate molar ratios, and write chemical equations. Materials are sufficient for 30 students.
Determine the molar ratio of reactants in 2 acid-base reactions using the method of continuous variation. Teach this activity using either the guided activity or inquiry activity. In the guided activity, students react volumes of acid and base in different ratios and graph the temperature changes. The volume ratio that produces the largest temperature change is the correct stoichiometry of the reaction. From their data, students identify their unknown acid from a list of 9 possibilities. In the inquiry activity, students design an experiment to determine the stoichiometry of an acid-base reaction. The inquiry activity provides an opportunity for students to present their experiment's design and results, reinforcing the practice of communicating findings. Detailed preparation and procedure notes guide you through leading a successful inquiry exercise, including a suggested rubric for assessing student performance.
Both activities include Big Idea assessment questions that follow the format of the AP® Chemistry Exam free-response questions. In the Big Idea assessment, students apply their new knowledge of continuous variation to determine the stoichiometry of a reaction between lead ion and iodide ion. Students determine the formula of the product and the oxidation number of the lead ion. In the second question, students use data provided to determine the stoichiometry of a reaction between iron ion and a ligand to form a complex.
This kit provides the following AP® Chemistry experiences; design a procedure to collect data, analyze data, plot data, calculate molar ratios, write and balance chemical equations, and note indicators that a chemical change has occurred. Materials are sufficient for 30 students working in teams of 3. Digital teacher’s manual, included FREE with kit purchase, is a 12-month eBook license to the Stoichiometry of Chemical Reactions teacher’s manual. You can also access the digital student guide for this kit for free at
AP® is a trademark registered and/or owned by the College Board, which was not involved in the production of, and does not endorse, these products.
|Sodium Hydroxide, Pellets, 250 g||1||Included|
|1 M Sulfuric Acid, 1 L||2||Included|
|1 M Hydrochloric Acid, 1 L||2||Included|
|Teacher's Manual and Reproducible Student Guide||1||Included|
|Graduated Cylinders, 10 mL||10||Needed, Not included|
|Beakers, 400 mL||10||Needed, Not included|
|Graduated Cylinders, 100 mL||10||Needed, Not included|
|Beakers, 250 mL||20||Needed, Not included|
|Volumetric Flasks with Caps, 1 L||3||Needed, Not included|
|Markers||10||Needed, Not included|
|Thermometers||10||Needed, Not included|
|Wash Bottles of Distilled Water||10||Needed, Not included|
|Balance||1||Needed, Not included|
|Weigh Boats||Needed, Not included|
|Waste Containers||Needed, Not included|
|Paper Towels||Needed, Not included|
|Safety Goggles, Gloves, and Lab Aprons (for each student)||Needed, Not included|
|Pipets (optional)||Needed, Not included|
If you are an AP teacher, you go out of your way to help your students perform successfully on the AP Exam. Carolina Investigations® for AP* Chemistry Kits are specifically designed to help you do just that.
Carolina Investigations® for AP Chemistry kits are designed to help AP teachers help their students achieve exceptional results by:
Carolina is proud to be the only supplier with unique kits and activities that are specifically designed for the new AP curriculum. We will also continue offering the traditional AP labs. In the end, whether you want to use one of our kits, follow a College Board lab, or design your own experiment, Carolina has the products and solutions you need.
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*AP is a registered trademark of the College Board, which was not involved in the production of, and does not endorse, these products.
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