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Measuring Acid Strength—Ka Values of Weak Acids—Student Laboratory Kit

By: The Flinn Staff

Item #: AP6364

Price: $31.00

The Measuring Acid Strength Chemistry Laboratory Kit presents students with the theory of acidity, equilibrium and constants. The experiment presents a methodology for finding that the pH of the solution is equal to the pKa of the acid.

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Do your students understand why some acids have lower pH values than others, even though their concentrations are the same? Acids vary greatly in their strength—their ability to produce hydrogen ions when dissolved in water. This lab will help you explain this concept and teach students about equilibrium constants for weak acids. Students neutralize exactly half of a solution of a weak acid. This gives them a solution containing an equal molar amount of the weak acid and its conjugate base. The pH of the solution is equal to the pKa value of the acid. Kit includes four different weak acid salts—use them as unknowns or let students match their results against the literature. Accurate results ensure that you will be successful with either approach! Includes reproducible student handouts, detailed background information, Teacher Notes with sample data and answers to questions and all necessary chemicals.

Complete for 30 students working in pairs. pH meters, sensors or probes are required and available separately. This is an excellent experiment for using your technology probeware.