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Determination of Ka of Weak Acids—College Level Classic General Chemistry Laboratory Kit

By: The Flinn Staff

Item #: AP7951

Price: $42.40

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College Level Classic General Chemistry Lab Kit: Determination of Ka of Weak Acids is an engaging activity where the Ka value for the ionization of two unkown weak acids is measured.

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College Level Classic General Chemistry Experiment 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 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