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Determination of Ka of Weak Acids - AP* Chemistry Classic Laboratory Kit

by Flinn Scientific

Item #: AP6358

Price: $30.00

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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Product Details

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. Solutions containing equal molar amounts of the weak acids and their conjugate bases are prepared by “half-neutralization” of the acid. Their pH values are measured and used to calculate the pKa value for each unknown weak acid. These values are compared to a provided list of weak acid Ka values 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. Materials Supplied: Potassium dihydrogen phosphate Potassium hydrogen phthalate Potassium hydrogen sulfate Potassium hydrogen tartrate Acetylsalicylic acid Phenolphthalein solution Sodium hydroxide solution Flinn Transition Guide Available! Adapt this classic AP Chemistry experiment for guided-inquiry and correlate with the AP Chemistry curriculum framework with the Flinn Scientific Inquiry Guidance and AP* Chemistry Curriculum Alignment Guide. Follow the link below to find this valuable publication!

Specifications

Materials Included in Kit (for 24 students working in pairs): Potassium dihydrogen phosphate, potassium hydrogen phthalate, potassium hydrogen sulfate, potassium hydrogen tartrate, acetylsalicylic acid, phenolphthalein solution, sodium hydroxide solution. 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. *Advanced Placement and AP are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, these products.