Page 28 - Demo

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Flinn Lab Activities and Demonstrations
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Classic Experiments for General Chemistry,
continued
Determining the Stoichiometry of
Chemical Reactions—Laboratory Kit
By: The Flinn Staff
Students learn the method of continuous variation to determine the mole ratio of the reactants and predict the chemical formula of the product for specific chemical reactions. In Part 1, the students mix known amounts of iron(III) nitrate and sodium hydroxide in a series of reactions to form a precipitate of iron(III) hydroxide. Each reaction contains a differ- ent mole ratio of reactants. The volume of precipitate formed is then graphed versus mole ratio of reactants. The students extrapolate the data to determine the optimum ratio of reactants and predict the correct formula of the precipitated product. The experiment is repeated in Part 2 for copper(II) chloride and sodium phosphate. Students receive a visible reinforcement of the law of multiple proportions.
Complete for 24 students working in pairs.
Synthesis and Analysis of a Coordination Compound—Laboratory Kit
By: The Flinn Staff
Students synthesize the coordination compound potassium trioxalatoferrate(III) trihydrate, K3[Fe(C2O4)3]•3H2O. Once produced, the product is identified by colorimetric methods and the percent yield of the product is determined. The absorbance of a solution of the prod- uct will be taken at three wavelengths. The ratios of these absorbances are used to identify the compound in solution as K3[Fe(C2O4)3]•3H2O. The lab provides the students with experience in both synthesis tech- niques and the process of spectrophotometry.
Complete for 24 students working in pairs.
Synthesis, Isolation and Purification of an Ester— Laboratory Kit
By: The Flinn Staff
Students perform a quantitative esterification reaction to produce ethyl acetate. The lab consists of three parts—in Part 1, ethyl acetate is prepared; in Part 2, the ethyl acetate is purified, and in Part 3, tests are performed to verify the identity of the ethyl acetate. The theoretical yield is then calculated and the percent yield is determined. Students receive hands-on experience with common organic chemistry tech- niques, such as refluxing, extractions, and distillation.
Complete for 24 students working in pairs.
Thermodynamics—Enthalpy of Reaction
and Hess’s Law—Laboratory Kit
By: The Flinn Staff
In this experiment, students verify Hess’s law. Three acid–base reac- tions, chosen so the third reaction equation equals the first reaction minus the second, are measured for temperature change by calorimetry. The values of heat change and enthalpy of reaction are calculated for each of the three reactions. The reaction results are then compared to verify Hess’s law. Students gain valuable experience with the process of calorimetric determinations.
Determining the Stoichiometry of Chemical Reactions—Laboratory Kit AP7962
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
AP7962
Determining the Stoichiometry of Chemical Reactions—Laboratory Kit
$78.20
Catalog No.
Description
Price/Each
AP7963
Synthesis and Analysis of a Coordination Compound—Laboratory Kit
$55.25
Synthesis and Analysis of a Coordination Compound—Laboratory Kit AP7963
Catalog No.
Description
Price/Each
AP7964
Synthesis, Isolation, and Purification of an Ester—Laboratory Kit
$52.45
Complete for 24 students working in pairs.
Synthesis, Isolation, and Purification of an Ester—Laboratory Kit AP7964
Catalog No.
Description
Price/Each
AP7965
Thermodynamics—Enthalpy of Reaction and Hess’s Law—Laboratory Kit
$77.75
Thermodynamics—Enthalpy of Reaction and Hess’s Law—Laboratory Kit AP7965