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