Page 24 - Demo

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Flinn Lab Activities and Demonstrations
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Classic Experiments for General Chemistry,
continued
Electrochemical Cells—Laboratory Kit
By: The Flinn Staff
A microscale series of half-cells is constructed by placing a piece of metal into a solution of the metal’s ions. The half-cells are connected by a salt bridge and the reduction potential of each cell is measured. Students then construct a table of reduction potentials and apply the Nernst equation through further experimentation. Students learn how to use a voltmeter, determine the anode and cathode of a cell, and calculate net ionic equations.
Complete for 24 students working in pairs.
Molar Mass by Freezing Point Depression— Laboratory Kit
By: The Flinn Staff
Students determine the molar mass of an unknown substance by measuring the freezing point depression of a solution of an unknown substance and the compound BHT (2,6-Di-tert-butyl-4-methylphenol). The freezing point of BHT is determined first, followed by the freez- ing point of a solution of the known substance dissolved in BHT. The freezing depression constant, kfp, for BHT is calculated from these values and used, along with the freezing point depression of a solu- tion of the unknown substance and BHT, to calculate the molar mass of the unknown. Students gain the recommended familiarity with the observation and recording of phase changes. An alternative microscale procedure is included as a supplement.
Complete for 24 students working in pairs.
Gravimetric Analysis of a Metal Carbonate— Laboratory Kit
By: The Flinn Staff
In this laboratory, students determine the identity of a Group 1 metal carbonate by gravimetric analysis. The unknown is weighed, dissolved in water and precipitated as calcium carbonate. The precipitate is filtered, dried and weighed. From the data, the formula weight and the identity of the unknown metal carbonate are determined. Students gain valuable experience in the process of gravimetric analysis. The lab is free of the heavy metal waste typically generated with most gravimetric analysis labs.
Complete for 24 students working in pairs.
Selecting Indicators for Acid–Base Titrations— Laboratory Kit
By: The Flinn Staff
Students select the appropriate indicators for two titrations—a weak acid solution titrated with a strong base solution and a weak base solu- tion titrated with a strong acid solution. The indicators are added to the solutions and the students perform the titrations. Titration curves of pH versus volume of titrant are generated and used to verify the appropriate- ness of the selected indicators. Students gain valuable experience with the process of titration using indicators and pH meters. An excellent assess- ment of student understanding of the principles of acid–base chemistry.
Complete for 24 students working in pairs.
CLASSIC EXPERIMENTS FOR GENERAL CHEMISTRY continued on next page.
Electrochemical Cells—Laboratory Kit AP7947
Molar Mass by Freezing Point Depression— Laboratory Kit
AP7948
Catalog No.
Description
Price/Each
AP7947
Electrochemical Cells—Laboratory Kit
$135.40
Classic Experiments for General Chemistry—22-Kit Bundle
Save by ordering the complete Guided-Inquiry Experiments for General Chemistry—22-Kit Bundle! Comprehensive, cost-saving bundle includes all 22 of the kits on pages 21–26.
Catalog No.
Description
Price/Each
AP7966
Classic Experiments for General Chemistry—22-Kit Bundle
$1318.00
Catalog No.
Description
Price/Each
AP7948
Molar Mass by Freezing Point Depression—Laboratory Kit
$38.50
Catalog No.
Description
Price/Each
AP7949
Gravimetric Analysis of a Metal Carbonate—Laboratory Kit
$44.25
Gravimetric Analysis of a Metal Carbonate—Laboratory Kit AP7949
Catalog No.
Description
Price/Each
AP7950
Selecting Indicators for Acid–Base Titrations—Laboratory Kit
$58.50
Selecting Indicators for Acid–Base Titrations—Laboratory Kit AP7950