Item #: AP6445
With the pH Properties of Buffer Solutions Classic Lab Kit for AP® Chemistry, students investigate the properties of buffer solutions. This lab is challenging and tests students’ understanding of pH and buffer chemistry.
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Classic AP Requirement #19—Preparation and Properties of Buffer Solutions
In this laboratory, students investigate the properties of buffer solutions. The students make two ideal buffer solutions, one consisting of a weak acid and its conjugate base and the other, a weak base and its conjugate acid. The initial pH of each solution is determined. Strong acid and strong base are then added to each buffer in a series of steps, with the pH determined after each addition. The resulting pH values after each addition are compared to calculated values for each buffer. A challenging lab to test students’ understanding of pH and buffer chemistry.
Complete for 24 students working in pairs.
pH Properties of Buffer Solutions 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:
Acetic acid solution, 0.1 M, 500 mL, 2
Ammonia/Ammonium chloride buffer, pH 9.26, 500 mL, 3
Hydrochloric acid solution, 0.2 M, 400 mL
Sodium acetate solution, 0.1 M, 500 mL, 2
Sodium hydroxide solution, 0.2 M, 200 mL, 2
Pipet, Beral-type, graduated, 50
Additional Materials Required (for each lab group): pH 7 buffer solution, distilled water, beakers, graduated cylinders, magnetic stirrer and stir bar (optional), marking pen, pH meter (or pH sensor), stirring rod, wash bottle.
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Correlation to Next Generation Science Standards (NGSS)†
Science & Engineering Practices
Planning and carrying out investigations
Analyzing and interpreting data
Asking questions and defining problems
Using mathematics and computational thinking
Disciplinary Core Ideas
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions
Scale, proportion, and quantity
Cause and effect
Systems and system models
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.
HS-PS1-7: Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.