| Journal Articles: 35 results |
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An Inexpensive Solution Calorimeter Emma Kavanagh, Sam Mindel, Giles Robertson, and D. E. Peter Hughes
Describes the construction of a simple solution calorimeter, using a miniature bead thermistor as a temperature-sensing element, that has a response time of a few seconds and made it possible to carry out a thermometric reaction in under a minute.
Kavanagh, Emma; Mindel, Sam; Robertson, Giles; Hughes, D. E. Peter. J. Chem. Educ. 2008, 85, 1129.
Acids / Bases |
Aqueous Solution Chemistry |
Calorimetry / Thermochemistry |
Laboratory Equipment / Apparatus |
Thermal Analysis |
Thermodynamics
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Yet Another Variation on the Electrolysis of Water at Iron Nails Mark T. Stauffer and Justin P. Fox
Describes a variation on the electrolysis of water with iron nails in which a sharp contrast in the colors produced effectively demonstrates electrolysis and the diffusion of oxidized and reduced species from the electrodes.
Stauffer, Mark T.; Fox, Justin P. J. Chem. Educ. 2008, 85, 523.
Acids / Bases |
Electrochemistry |
Oxidation / Reduction |
Stoichiometry |
Water / Water Chemistry |
Electrolytic / Galvanic Cells / Potentials
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Constructing a Graphic Organizer in the Classroom: Introductory Students' Perception of Achievement Using a Decision Map To Solve Aqueous Acid–Base Equilibria Problems Stephen DeMeo
A decision map is a directional heuristic that helps learners solve problems within a generic framework. The decision map that is presented was created to solve pH problems of varying difficulty that introductory college chemistry students encounter when studying acidbase equilibria.
DeMeo, Stephen. J. Chem. Educ. 2007, 84, 540.
Acids / Bases |
Equilibrium
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pH Paradoxes: Demonstrating That It Is Not True That pH ≡ -log[H+] Christopher G. McCarty and Ed Vitz
Six demonstrations highlighting paradoxes that arise if pH is incorrectly defined as -log[H+] are presented as justification for the recommendation that pH should be correctly defined as pH = -log aH+ in textbooks.
McCarty, Christopher G.; Vitz, Ed. J. Chem. Educ. 2006, 83, 752.
Acids / Bases |
Aqueous Solution Chemistry |
Ion Selective Electrodes |
pH |
Quantitative Analysis
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Teaching pH Measurements with a Student-Assembled Combination Quinhydrone Electrode Fritz Scholz, Tim Steinhardt, Heike Kahlert, Jens R. Pörksen, and Jürgen Behnert
A combination pH electrode that can be assembled by the student is described. It consists of a glass holder and two sensors in the form of rubber stoppers that contain quinhydrone and graphite. The combination electrode is suitable to teach potentiometric measurements, pH measurements, and the interplay of acidbase and redox equilibria. The electrode meets highest safety standards and overcomes the troubles associated with the use of the conventional quinhydrone electrode.
Scholz, Fritz; Steinhardt, Tim; Kahlert, Heike; Pörksen, Jens R.; Behnert, Jürgen. J. Chem. Educ. 2005, 82, 782.
Acids / Bases |
pH |
Laboratory Equipment / Apparatus |
Electrochemistry
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Analysis of Natural Buffer Systems and the Impact of Acid Rain. An Environmental Project for First-Year Chemistry Students David C. Powers, Andrew T. Higgs, Matt L. Obley, Phyllis A. Leber, Kenneth R. Hess, and Claude H. Yoder
The purpose of this project is to investigate the basic principles involved in acidbase buffer systems within the context of an environmental issue. It is designed for use in an introductory chemistry course. The students will learn about acidbase interactions and examine how a buffer system composed of a weak acid and its conjugate base can neutralize large quantities of strong acid while resisting drastic change in the pH of the system. Students will also analyze experimentally the various components of the most commonly occurring natural buffer system.
Powers, David C.; Higgs, Andrew T.; Obley, Matt L.; Leber, Phyllis A.; Hess, Kenneth R.; Yoder, Claude H. J. Chem. Educ. 2005, 82, 274.
Acids / Bases |
Aqueous Solution Chemistry |
Equilibrium
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Palm-Based Data Acquisition Solutions for the Undergraduate Chemistry Laboratory Susan Hudgins, Yu Qin, Eric Bakker, and Curtis Shannon
Handheld computers provide a compact and cost-effective means to log data in the undergraduate chemistry laboratory. Handheld computers have the ability to record multiple forms of data, be programmed for specific projects, and later have data transferred to a personal computer for manipulation and analysis.
Hudgins, Susan; Qin, Yu; Bakker, Eric; Shannon, Curtis. J. Chem. Educ. 2003, 80, 1303.
Acids / Bases |
Electrochemistry |
Instrumental Methods |
Laboratory Computing / Interfacing |
Laboratory Equipment / Apparatus
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Chemical Domino Demonstration M. Dale Alexander
The Chemical Domino Demonstration is both educational and entertaining. It provides an excellent means for a review of chemical concepts at the conclusion of a general chemistry course. This demonstration consists of a number of different chemical reactions occurring in sequence in a Rube Goldberg-type apparatus.
M. Dale Alexander. J. Chem. Educ. 1998, 75, 490.
Reactions |
Acids / Bases |
Oxidation / Reduction
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From Titration Data to Buffer Capacities: A Computer Experiment for the Chemistry Lab or Lecture Roy W. Clark, Gary D. White, Judith M. Bonicamp, and Exum D. Watts
Provides titration curve data that students can plot and analyze using spreadsheets to develop student understanding of pH, derivatives, buffer capacity, and the behavior of dilute buffers; includes sample graphs and analysis.
Clark, Roy W.; White, Gary D.; Bonicamp, Judith M.; Watts, Exum D. J. Chem. Educ. 1995, 72, 746.
Acids / Bases |
pH |
Titration / Volumetric Analysis |
Chemometrics
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The electrician's multimeter in the chemistry teaching laboratory: Part 2: Potentiometry and conductimetry Sevilla, Fortunato, III; Alfonso, Rafael L.; Andres, Roberto T.
Further applications of the multimeter in chemistry laboratories are discussed in this paper: potentiometry, reduction potentials and cell EMF, the Nerst equations, pH measurements, titration, conductimetry, and conduction of solutions.
Sevilla, Fortunato, III; Alfonso, Rafael L.; Andres, Roberto T. J. Chem. Educ. 1993, 70, 580.
Acids / Bases |
Solutions / Solvents |
Titration / Volumetric Analysis |
Electrochemistry |
Laboratory Equipment / Apparatus |
Potentiometry
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A low-cost pH meter for the classroom. Harris, David L.; Harris, Daniel C.
Design of an inexpensive yet precise pH meter for classroom use.
Harris, David L.; Harris, Daniel C. J. Chem. Educ. 1992, 69, 563.
Laboratory Equipment / Apparatus |
pH |
Acids / Bases
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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
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Measurements of equilibrium constants of acid-base indicators with a blocktronic colorimeter Walters, David; Birk, James P.
A computer-interfaced measurement of equilibrium constants of acid-base indicators (methyl orange, methyl red, and phenolphthalein).
Walters, David; Birk, James P. J. Chem. Educ. 1990, 67, A252.
Acids / Bases |
Dyes / Pigments |
Spectroscopy |
Equilibrium |
Laboratory Computing / Interfacing
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Construction of a photoelectric colorimeter and application to students' experiments (Part 2) Matsuo, Tsutomu; Muromatsu, Akihiko; Katayama, Kazuko; Mori, Minako
Applications include the quantitative analysis of copper in brass, the analysis of iron in spinach and tea leaves, and the determination of the acid dissociation constant of bromothymol blue.
Matsuo, Tsutomu; Muromatsu, Akihiko; Katayama, Kazuko; Mori, Minako J. Chem. Educ. 1989, 66, 848.
Laboratory Equipment / Apparatus |
Quantitative Analysis |
Acids / Bases |
Dyes / Pigments
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pH measurements on the overhead projector Solomon, Sally; High, Nancy
Universal indicator solution and a corresponding pH indicator chart are used to make pH measurements of an overhead projector where the results are visible to all students in a large lecture hall.
Solomon, Sally; High, Nancy J. Chem. Educ. 1987, 64, 964.
pH |
Acids / Bases |
Dyes / Pigments
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Buffer capacity: An undergraduate laboratory experiment Russo, Steven O.; Hanania, George I. H.
A quantitative experiment that can demonstrate buffer action and the measurement of buffer capacity, for a given buffer system, over a range of pH.
Russo, Steven O.; Hanania, George I. H. J. Chem. Educ. 1987, 64, 817.
Acids / Bases |
pH |
Aqueous Solution Chemistry
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Density gradient columns for chemical displays Guenther, William B.
An important advantage of these demonstrations of complex chemistry is that students can observe them over a period of time as they grasp concepts of solution equilibria.
Guenther, William B. J. Chem. Educ. 1986, 63, 148.
Acids / Bases |
pH |
Coordination Compounds |
Metals
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Buffer demonstration Ophardt, Charles E.
Emphasizes the difference in properties between strong and weak acids and that only a weak acid or base and its salt are a buffer.
Ophardt, Charles E. J. Chem. Educ. 1985, 62, 608.
Acids / Bases |
pH |
Dyes / Pigments
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To buffer or not to buffer, that is the question Mancott, A.
Question involves the preparation of a buffer solution by a chemical reaction but does not have the resultant solution act as a buffer.
Mancott, A. J. Chem. Educ. 1985, 62, 606.
Acids / Bases |
pH
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A simple demonstration of buffer action Duerst, Marilyn D.
A simple yet impressive visual demonstration of buffer action.
Duerst, Marilyn D. J. Chem. Educ. 1985, 62, 435.
Acids / Bases |
pH
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The preparation of acid-base titration curves McClendon, Michael
A simple technique for generating mechanically plotted titration curves using an electron pH meter and a low-voltage chart recorder.
McClendon, Michael J. Chem. Educ. 1984, 61, 1022.
Acids / Bases |
Titration / Volumetric Analysis |
Laboratory Equipment / Apparatus |
Quantitative Analysis
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A pocket calculator program for the solution of pH problems via the method of successive approximations Guida, Wayne C.
37. Bits and pieces, 14. A description of a pocket calculator program for the solution of pH problems via the method of successive approximations .
Guida, Wayne C. J. Chem. Educ. 1983, 60, 101.
pH |
Acids / Bases |
Chemometrics
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Buffer effect demonstration on the overhead projector Hobe, Paul G., Jr.
Illustrates that one drop of dilute acid or base will change the pH of water by a large amount while larger amounts can be added to a buffer solution before any change is noted.
Hobe, Paul G., Jr. J. Chem. Educ. 1979, 56, 47.
Acids / Bases |
pH
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A simple, effective demonstration of titration curves and indicator selection Nathan, Lawrence C.
The concepts of acid-base titration curves and selection of the appropriate indicator for an acid-base titration can be easily and effectively demonstrated by use of a potentiometric titration.
Nathan, Lawrence C. J. Chem. Educ. 1973, 50, 262.
Acids / Bases |
Dyes / Pigments |
Titration / Volumetric Analysis |
pH |
Quantitative Analysis
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Determination of successive ionization constants: A computer assisted laboratory experiment Jensen, R. E.; Garvey, R. G.; Paulson, B. A.
The computer programs described here plot students' titration data, locate equivalence points of the titration, calculate the apparent equivalent mass of the acid, and determine the successive ionization constants of the acid.
Jensen, R. E.; Garvey, R. G.; Paulson, B. A. J. Chem. Educ. 1970, 47, 147.
Acids / Bases |
Aqueous Solution Chemistry |
Titration / Volumetric Analysis
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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
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Letter to the editor Roberts, N. K.
Discusses the action of buffer solutions to resist changes in pH.
Roberts, N. K. J. Chem. Educ. 1966, 43, 108.
Acids / Bases |
pH |
Aqueous Solution Chemistry
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The hydration of carbon dioxide: A double clock experiment Jones, P.; Haggett, Max L.; Longridge, Jethro L.
This extension of the "Soda Water Clock" experiment provides a quantitative kinetics investigation.
Jones, P.; Haggett, Max L.; Longridge, Jethro L. J. Chem. Educ. 1964, 41, 610.
Reactions |
Rate Law |
Kinetics |
pH |
Acids / Bases |
Aqueous Solution Chemistry
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Glass tubes coated with methyl violet as an indicator McKaig, Nelson, Jr.
Describes the use of glass tubes coated with methyl violet as an indicator as a method superior to paper strips.
McKaig, Nelson, Jr. J. Chem. Educ. 1964, 41, 439.
Qualitative Analysis |
Acids / Bases |
Aqueous Solution Chemistry
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A versatile and inexpensive pH recording electrometer Malmstadt, H. V.
Presents the design and operation of a modular pH unit with automatic temperature compensation.
Malmstadt, H. V. J. Chem. Educ. 1964, 41, 148.
pH |
Acids / Bases |
Aqueous Solution Chemistry
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Development of the pH concept: A historical survey Szabadvary, Ferenc; Oesper, Ralph E., trans.
Traces the historical development of the following: a recognition of the importance of hydrogen ion concentration; an understanding of buffer solutions; and the concept and measurement of pH.
Szabadvary, Ferenc; Oesper, Ralph E., trans. J. Chem. Educ. 1964, 41, 105.
pH |
Acids / Bases |
Aqueous Solution Chemistry
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Demonstrations for the overhead projector Spiegler, K. S.; Gruenberg, J.; Trattner, Adriana; Weiss, W.
Demonstrations include the production of iron, potentiometric titration, photography, and the measurement of pH by indicators.
Spiegler, K. S.; Gruenberg, J.; Trattner, Adriana; Weiss, W. J. Chem. Educ. 1962, 39, 86.
Titration / Volumetric Analysis |
pH |
Aqueous Solution Chemistry |
Acids / Bases
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Easily prepared wide range buffer series Carmody, Walter R.
A series of buffers with pH values ranging from 2.0 to 12.0 that requires the preparation of only two stock solutions and requires only three common chemicals.
Carmody, Walter R. J. Chem. Educ. 1961, 38, 559.
Aqueous Solution Chemistry |
Acids / Bases |
pH |
Laboratory Management
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pH meters (continued) Lewin, S. Z.
Considers the standardization, calibration, and testing of pH meters, as well as Beckman pH meters.
Lewin, S. Z. J. Chem. Educ. 1959, 36, A595.
Instrumental Methods |
pH |
Acids / Bases |
Aqueous Solution Chemistry |
Calibration
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pH approximations McBay, Arthur J.
Describes the use of data from tables to approximate pH values.
McBay, Arthur J. J. Chem. Educ. 1952, 29, 526.
pH |
Acids / Bases |
Aqueous Solution Chemistry
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