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Journal Articles: 18 results
Phenolphthalein—Pink Tornado Demonstration  Bruce R. Prall
This demonstration uses the vortex generated by a spinning magnetic stir bar to demonstrate Le Châtelier's principle as it applies to the phenolphthalein equilibrium in water and provides an excellent opportunity to discuss limiting and excess reagents.
Prall, Bruce R. J. Chem. Educ. 2008, 85, 527.
Acids / Bases |
Equilibrium |
Kinetics |
pH
Using Visible Spectrophotometers and pH Measurements To Study Speciation in a Guided-Inquiry Laboratory   William H. Otto, Cynthia K. Larive, Susan L. Mason, Janet B. Robinson, Joseph A. Heppert, and James D. Ellis
A collective-effort, guided-inquiry laboratory investigation was developed for the second-semester general chemistry laboratory for the purpose of increasing student conceptual understanding of equilibrium and speciation phenomena. This investigation required students to employ the chemical indicator phenol red in phosphate buffer solution, computer interfaced pH probes, and visible spectrophotometers. Through a combination of potentiometric and visible absorption measurements, the students determined the pH conditions that alter equilibrium concentrations of multiple species (colored and transparent) in solution.
Otto, William H.; Larive, Cynthia K.; Mason, Susan L.; Robinson, Janet B.; Heppert, Joseph A.; Ellis, James D. J. Chem. Educ. 2005, 82, 1552.
Acids / Bases |
UV-Vis Spectroscopy |
Equilibrium |
pH |
Water / Water Chemistry |
Dyes / Pigments
Acid Rain Demonstration: The Formation of Nitrogen Oxides as a By-Product of High-Temperature Flames in Connection with Internal Combustion Engines  Jerry A. Driscoll
This demonstration illustrates the formation of nitrogen oxides resulting from a high temperature flame.
Driscoll, Jerry A. J. Chem. Educ. 1997, 74, 1424.
Equilibrium |
Learning Theories |
Water / Water Chemistry |
Oxidation / Reduction
Preparing "Chameleon Balls" from Natural Plants: Simple Handmade pH Indicator and Teaching Material for Chemical Equilibrium  Naoki Kanda, Takayuki Asano, Toshiyuki Itoh, and Makoto Onoda
Description of preparation and use of polysaccharide beads containing anthocyanins to teach students about chemical equilibrium under different pH conditions.
Kanda, Naoki; Asano, Takayuki; Itoh, Toshiyuki; Onoda, Makota. J. Chem. Educ. 1995, 72, 1131.
Acids / Bases |
Plant Chemistry |
Equilibrium |
Dyes / Pigments |
pH
Teaching the Truth about pH  Hawkes, Stephen J.
-log[H+] is only an approximation to pH; how to teach pH to avoid misleading students.
Hawkes, Stephen J. J. Chem. Educ. 1994, 71, 747.
pH |
Acids / Bases |
Aqueous Solution Chemistry |
Equilibrium
Fruit Anthocyanins: Colorful Sensors of Molecular Milieu  Curtright, Robert D.; Rynearson, James A .; Markwell, John
Provides background and references as a starting point for the further exploration of anthocyanins.
Curtright, Robert D.; Rynearson, James A .; Markwell, John J. Chem. Educ. 1994, 71, 682.
Dyes / Pigments |
Acids / Bases |
Equilibrium |
pH
Chemical equilibrium: VIII. Precipitates   Gordus, Adon A.
The final article in a series (see previous months this year): This article focuses on ionic precipitates in water and how buffered solutions allow easier calculation of solubilities.
Gordus, Adon A. J. Chem. Educ. 1991, 68, 927.
Acids / Bases |
Equilibrium |
pH |
Precipitation / Solubility |
Aqueous Solution Chemistry |
Water / Water Chemistry
Advanced titration plots using spreadsheet scripting  Currie, James O., Jr.; Whiteley, Richard V., Jr.
131. A spreadsheet aids in student understanding of acid/base titration calculations.
Currie, James O., Jr.; Whiteley, Richard V., Jr. J. Chem. Educ. 1991, 68, 923.
Acids / Bases |
Titration / Volumetric Analysis |
pH |
Laboratory Computing / Interfacing |
Equilibrium
Acid and base dissociation constants of water and its associated ions  de Lange, A. M.; Potgieter, J. H.
By applying the Bronsted-Lowry concept of acids and bases, one can derive acid and base dissociation constants for water and its associated ions.
de Lange, A. M.; Potgieter, J. H. J. Chem. Educ. 1991, 68, 304.
Acids / Bases |
Equilibrium |
pH |
Brønsted-Lowry Acids / Bases
A modified graphical method for acid-base equilibria  Nakagawa, Kuniaki
A method based on logarithmic diagrams for finding the pH values for various systems in acid-base equilibria.
Nakagawa, Kuniaki J. Chem. Educ. 1990, 67, 673.
Acids / Bases |
Equilibrium |
pH
Why teach solution equilibrium?  Butler, James N.
What are the most important aspects of solution equilibrium to teach at the elementary level?
Butler, James N. J. Chem. Educ. 1984, 61, 784.
Equilibrium |
Solutions / Solvents |
Acids / Bases |
pH
The effects of HCl and aspirin on the stomach: An equilibrium review  DeLorenzo, Ronald
The chemical effect and medical implications of taking aspirin.
DeLorenzo, Ronald J. Chem. Educ. 1977, 54, 306.
Equilibrium |
Acids / Bases |
pH |
Drugs / Pharmaceuticals |
Medicinal Chemistry |
Applications of Chemistry
Effect of Ionic Strength on Equilibrium Constants  Seymour, M. D.; Fernando, Quintus
Involves the determination of the acid dissociation constant of bromcresol green by a spectrophotometric method; using a graphing calculator, each student can perform the laboratory work and obtain his own data set.
Seymour, M. D.; Fernando, Quintus J. Chem. Educ. 1977, 54, 225.
Acids / Bases |
Aqueous Solution Chemistry |
Equilibrium |
pH
Ratio diagrams: A simple graphical representation of complicated equilibria  de Levie, R.
Introduces and demonstrates the usefulness and general applicability of ratio diagrams as the simplest graphical representation of equilibria involving mononuclear species.
de Levie, R. J. Chem. Educ. 1970, 47, 187.
Equilibrium |
Acids / Bases |
pH |
Aqueous Solution Chemistry |
Precipitation / Solubility
Component concentrations in solutions of weak acids  Goldish, Dorothy M.
presents a new approach to teaching the subject of weak acid equilibria and its associated calculations.
Goldish, Dorothy M. J. Chem. Educ. 1970, 47, 65.
Acids / Bases |
Aqueous Solution Chemistry |
Equilibrium |
Chemometrics |
pH
A computer program for use in teaching chemical equilibrium  Zajicek, O. T.
Describes a computer program for use in teaching chemical equilibrium.
Zajicek, O. T. J. Chem. Educ. 1965, 42, 622.
Equilibrium |
Acids / Bases |
pH
Teaching ionic equilibrium: Use of log chart transparencies  Freiser, Henry; Fernando, Quintus
The use of graphical methods brings the problem of significance of various terms in complicated expressions into proper focus. Furthermore, a pictorial representation permits the student to see at a glance how the concentrations of various species in a system at equilibrium change with conditions.
Freiser, Henry; Fernando, Quintus J. Chem. Educ. 1965, 42, 35.
Aqueous Solution Chemistry |
Equilibrium |
Acids / Bases |
pH |
Chemometrics |
Brønsted-Lowry Acids / Bases
Automatic titrimetry in introductory college chemistry  Zajicek, O. T.
The experiment described here employs an automatic pH titrator as a tool for the teaching of a detailed treatment of simultaneous equilibria.
Zajicek, O. T. J. Chem. Educ. 1964, 41, 554.
Titration / Volumetric Analysis |
pH |
Aqueous Solution Chemistry |
Acids / Bases |
Equilibrium