Item #: AP6450
The Determining the Molar Volume of a Gas Classic Lab Kit for AP® Chemistry involves determining the volume of one mole of hydrogen gas at standard temperature and pressure (STP). A water displacement technique yields hydrogen for analysis.
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Classic AP Requirement #5—Determination of the Molar Volume of a Gas
In this experiment, students determine the volume of one mole of hydrogen gas at standard temperature and pressure (STP). Hydrogen is generated by the reaction of a known mass of magnesium with an excess of hydrochloric acid in an inverted gas measuring tube filled with water. The volume of hydrogen collected by water displacement is measured and corrected for differences in temperature and pressure in order to calculate the molar volume of hydrogen at STP.
Complete for 24 students working in pairs.
Determining the Molar Volume of a Gas 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 wire, 18-gauge, 6 feet
Hydrochloric acid, 2 M, 500 mL
Magnesium ribbon, 6 feet
Stoppers, rubber, black, 1-hole, size #00, pkg/12
Additional Materials Required (for each lab group): 0.001-g precision balance (shared), barometer (optional), beakers, distilled or deionized water, eudiometer tubes, graduated cylinders, metric rulers, scissors or wire cutters (5–7 to share), thermometers, wash bottles.
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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
Scale, proportion, and quantity
Systems and system models
Energy and matter
Cause and effect
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.