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

Measuring Acid Strength - Ka Values of Weak Acids - Student Laboratory Kit, AP6364
Catalog Number
Measuring Acid Strength - Ka Values of Weak Acids - Student Laboratory Kit
Product Description

By: The Flinn Staff

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. The experiment itself is elegant in its simplicity. 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 but not provided. This is an excellent experiment for using your technology probeware.


Flinn pH Meter
• Large easy-to-read display • Replaceable electrode • Slim design easily fits into test tubes • Can be immersed to a depth of 80 mm • Store the electrode with a few drops of pH 7 buffer or tap water. Never use deionized or distilled water and never...
pH Sensor
More features and versatility than higher priced, full-featured pH meters. A terrific sensor for all pH applications, including microscale. Combination gel-filled electrode has a range of 0-14 pH. System includes pH electrode and a convenient soaking...
Additional Resources
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Flinn Catalog/Reference Manual Page 424
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