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Iron(III) Thiocyanate Revisited: A Physical Chemistry Equilibrium Lab Incorporating Ionic Strength Effects
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Abstract
A physical chemistry laboratory exercise is presented in which the thermodynamic equilibrium constant for Fe3+ + SCN- <--> Fe(SCN)2+ in 0.5 M acid is calculated from the experimentally observed equilibrium constant and activity coefficients generated by the Davies extension of the Debye-Hückel theory.
Keywords (Audience):
Upper-Division UndergraduateKeywords (Domain):
Physical ChemistryKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
EquilibriumCiting Articles
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This article has been cited by 8 ACS Journal articles (5 most recent appear below).
The Equilibrium Constant for Bromothymol Blue: A General Chemistry Laboratory Experiment Using Spectroscopy
Elsbeth Klotz, Robert Doyle, Erin Gross, and Bruce MattsonJournal of Chemical Education2011 88 (5), 637-639The Equilibrium Constant for Bromothymol Blue: A General Chemistry Laboratory Experiment Using Spectroscopy
Elsbeth Klotz, Robert Doyle, Erin Gross, and Bruce MattsonJournal of Chemical Education2011 88 (5), 637-639A simple, inexpensive, and environmentally friendly undergraduate laboratory experiment is described in which students use visible spectroscopy to determine a numerical value for an equilibrium constant, Kc. The experiment correlates well with the lecture ...
Colorimetric Determination of the Iron(III)−Thiocyanate Reaction Equilibrium Constant with Calibration and Equilibrium Solutions Prepared in a Cuvette by Sequential Additions of One Reagent to the Other
Frazier Nyasulu and Rebecca BarlagJournal of Chemical Education2011 88 (3), 313-314Colorimetric Determination of the Iron(III)−Thiocyanate Reaction Equilibrium Constant with Calibration and Equilibrium Solutions Prepared in a Cuvette by Sequential Additions of One Reagent to the Other
Frazier Nyasulu and Rebecca BarlagJournal of Chemical Education2011 88 (3), 313-314The well-known colorimetric determination of the equilibrium constant of the iron(III)−thiocyanate complex is simplified by preparing solutions in a cuvette. For the calibration plot, 0.10 mL increments of 0.00100 M KSCN are added to 4.00 mL of 0.200 M Fe(...
Multiple Experiments and a Single Measurement: Introducing Microplate Readers in the Laboratory
Santiago Botasini, Laura Luzuriaga, María F. Cerdá, and Eduardo Méndez, Gerardo Ferrer-Sueta and Ana DenicolaJournal of Chemical Education2010 87 (10), 1011-1014Multiple Experiments and a Single Measurement: Introducing Microplate Readers in the Laboratory
Santiago Botasini, Laura Luzuriaga, María F. Cerdá, and Eduardo Méndez, Gerardo Ferrer-Sueta and Ana DenicolaJournal of Chemical Education2010 87 (10), 1011-1014This report discusses the advantages of the use of microplate readers in instructional laboratories. Treated topics include equipment and supplies options, warnings and suggestions, as well as applications in analytical chemistry, physical chemistry, ...
Spectrophotometric Determination of Iron(III)–Glycine Formation Constant in Aqueous Medium Using Competitive Ligand Binding
Rajendra Prasad and Surendra PrasadJournal of Chemical Education2009 86 (4), 494Spectrophotometric Determination of Iron(III)–Glycine Formation Constant in Aqueous Medium Using Competitive Ligand Binding
Rajendra Prasad and Surendra PrasadJournal of Chemical Education2009 86 (4), 494The formation constant of iron(III) complex with glycine (Gly) ligand in aqueous acidic medium (0.2 M HNO3, I = 0.2 M at 28 ± 1 °C) was determined spectrophotometrically in which a competing color reaction between Fe(III) and SCN– was used as an indicator ...
Modern Developments in the Physical Chemistry Laboratory
Samuel A. Abrash2007 973 (), 115-151Modern Developments in the Physical Chemistry Laboratory
Samuel A. Abrash2007 973 (), 115-151Developments in the physical chemistry laboratory since the publication of the germinal text by Schwenz and Moore (1) are categorized and reviewed. The categories examined include modern instrumentation, current topics in chemistry, integrated ...
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- Received: August 03, 2009
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