FlinnPREP™ Inquiry Labs for AP® Chemistry: Buffers in Household Products
By: The Flinn Staff
Item #: AP7665
The Buffers in Household Products Inquiry Lab Solution for AP® Chemistry involves identifying regions in the neutralization of a polyprotic weak acid. Experiment results are used to identify buffering agents in eight household products.
Includes access to exclusive FlinnPREP™ digital content to combine the benefits of classroom, laboratory and digital learning. Each blended learning lab solution includes prelab videos about concepts, techniques and procedures, summary videos that relate the experiment to the AP® exam, built-in student lab safety training with assessments, and standards-based, tested inquiry labs with real sample data. FlinnPREP™ Inquiry Lab Solutions are adaptable to you and how you teach with multiple ways to access and run your AP® labs.
Big Idea 6, Investigation 15, Primary Learning Objective 6.20
Many household products contain buffering chemicals, such as citric acid, sodium carbonate, sodium benzoate and phosphates or phosphoric acid to safeguard their activity. Students discover the wide range of buffering action using this advanced inquiry lab activity.
The lab begins with an introductory activity to identify the buffering regions in the neutralization of a polyprotic weak acid. The results provide a model for guided-inquiry design of a procedure to determine the buffering agents in eight different household products, including foods and beverages and over-the-counter drugs. Procedures may include creating titration curves, calculating pKa values and analyzing the buffer capacity and composition. Students may recommend additional consumer products for further inquiry study.
Complete for 24 students working in pairs.
Materials Included in Kit: Alka-Seltzer® tablets, pkg/2, 3 Citric acid, 3 g Hydrochloric acid solution, 0.1 M, 500 mL, 4 Sodium hydroxide solution, 0.1 M, 500 mL, 4 Starch, liquid, 50 mL Gatorade®, G2 Series®, red (strawberry), 12 oz Lactaid® tablets, pkg/4 Lemon lime Kool-Aid®, packet, 3 Pineapple juice, can, 6 oz, 2 Tomato paste, can, 6 oz Tonic water, bottle, 1 L
Additional Materials Required (for each lab group): Distilled or deionized water, beakers, pH 7 buffer (to calibrate pH meter), buret, buret clamp, magnetic stirrer and stir bar, pH sensor or pH meter, support stand, wash bottle, 0.01-g precision balance, volumetric flask.
*AP is a registered trademark of the College Board, which was not involved in the production of, and does not endorse, this product.
Correlation to Next Generation Science Standards (NGSS)†
Science & Engineering Practices
Developing and using models Planning and carrying out investigations Analyzing and interpreting data Using mathematics and computational thinking Obtaining, evaluation, and communicating information
Disciplinary Core Ideas
HS-PS1.A: Structure and Properties of Matter HS-PS1.B: Chemical Reactions
Patterns Cause and effect Scale, proportion, and quantity
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-PS1-3. Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles.