Item #: AP6358
The Determination of Ka of Weak Acids Classic Lab Kit for AP* Chemistry allows students to measure the Ka value for the ionization of two unknown acids. pH values are then measured and utilized, calculating the pKa value of each unknown.
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Classic AP Requirement #10—Determination of the Equilibrium Constant for a Chemical Reaction
Students measure the Ka value for the ionization of two unknown weak acids. pH values are measured and used to calculate the pKa value for each unknown weak acid. These values are used to determine the identity of each acid. This laboratory challenges the students’ understanding of the relationship among Ka, pH and H3O+ concentration while providing the recommended familiarity with the use of pH meters.
Complete for 24 students working in pairs.
Determination of Ka of Weak Acids Inquiry Guidance & AP* Chemistry Curriculum Alignment Transition Guide available! Follow the link in Resources to find this valuable publication that lets youadapt this classic AP Chemistry experiment for guided-inquiry and correlate with the AP Chemistry curriculum framework.
Materials Included in Kit:
Acetylsalicylic acid, 4 g
Phenolphthalein solution, 0.5%, 30 mL
Potassium bisulfate, 4 g
Potassium bitartrate, 4 g
Potassium hydrogen phthalate, 4 g
Potassium phosphate, monobasic, 4 g
Sodium hydroxide solution, 0.1 M, 250 mL
Additional Materials Required (for each lab group): 0.01-g precision balances (3 to share), beaker, pH 4 and 7 buffer solutions, Erlenmeyer flask, graduated cylinder, pH Meter, Beral-type pipets, stirring rod, wash bottle with distilled or deionized water, weighing dishes.
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