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Determining the Stoichiometry of Chemical Reactions—Classic Laboratory Kit for AP® Chemistry

By: The Flinn Staff

Item #: AP6451

Price: $68.55

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The Determining the Stoichiometry of Chemical Reactions Classic Lab Kit for AP* Chemistry guides students in continuous variation to determine the mole ratio of reactants and predict chemical formulas of the products for various reactions.

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Classic AP Requirement #9—Determination of Mass and Mole Relationship in a Chemical Reaction

Learn the method of continuous variation to determine the mole ratio of the reactants and predict the chemical formula of the product for specific chemical reactions. In Part 1, the students mix known amounts of iron(III) nitrate and sodium hydroxide in a series of reactions to form a precipitate of iron(III) hydroxide. Each reaction contains a different mole ratio of reactants. The students extrapolate the data to determine the optimum ratio of reactants and predict the correct formula of the precipitated product. The experiment is repeated in Part 2 for copper(II) chloride and sodium phosphate.  

Complete for 24 students working in pairs.

Determining the Stoichiometry of Chemical Reactions Inquiry Guidance & 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: 
Copper(II) chloride solution, 0.05 M, 500 mL, 6
Iron(III) nitrate solution, 0.1 M, 500 mL, 3
Sodium hydroxide solution, 0.1 M, 500 mL, 8
Sodium phospate, tribasic solution, 0.05 M, 500 mL, 6

Additional Materials Required (for each lab group): Graduated cylinders, markers or labeling pen, long stirring rods.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Planning and carrying out investigations
Using mathematics and computational thinking
Analyzing and interpreting data
Engaging in argument from evidence

Disciplinary Core Ideas

HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Scale, proportion, and quantity
Systems and system models
Energy and matter
Cause and effect

Performance Expectations

HS-PS1-1: Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.
HS-PS1-2: Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.
HS-PS1-5: Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.