Journal Articles: 29 results 

Unified Approximations: A New Approach for Monoprotic Weak Acid–Base Equilibria Harry L. Pardue, Ihab N. Odeh, and Teweldemedhin M. Tesfai This article describes a new approach to approximate calculations for monoprotic acidbase equilibria in otherwise pure water. The new approach, identified herein as unified approximations, uses a simple decision criterion to select between situations that should be treated as deprotonation and protonation reactions. The remaining treatment takes account of changes in concentrations of conjugate acidbase pairs for all situations and ignores autoprotolysis only for situations for which the analytical concentration of either the conjugate acid or conjugate base will always be larger than zero. Pardue, Harry L.; Odeh, Ihab N.; Tesfai, Teweldemedhin M. J. Chem. Educ. 2004, 81, 1367.
Acids / Bases 
Equilibrium 
Chemometrics

Experimental Design and Multiplexed Modeling Using Titrimetry and Spreadsheets Peter de B. Harrington, Erin Kolbrich, and Jennifer Cline Determining the acidity of three vinegar samples using multiplexed titrations and an MS Excel spreadsheet. Harrington, Peter de B.; Kolbrich, Erin; Cline, Jennifer. J. Chem. Educ. 2002, 79, 863.
Acids / Bases 
Chemometrics 
Stoichiometry 
Titration / Volumetric Analysis

Predicting AcidBase Titration Curves without Calculations Dennis W. Barnum In this paper a qualitative and systematic method for sketching titration curves is presented. Even the more complex cases such as salts or polyprotic acids and bases are treated just as easily as simple monoprotic acids. Having students predict the shape of titration curves from known equilibrium constants helps to focus attention on the general principles without distraction by the mathematics. Barnum, Dennis W. J. Chem. Educ. 1999, 76, 938.
Acids / Bases 
Quantitative Analysis 
Water / Water Chemistry 
Equilibrium 
Learning Theories 
Titration / Volumetric Analysis 
Chemometrics

Do pH in Your Head Addison Ault Every aqueous solution has a pH. Two factors determine this pH: the acidic or basic strength of the solute, and its concentration. When you use pKa values to express acidic and basic strength you can easily estimate the approximate pH of many aqueous solutions of acids, bases, and their salts and their buffers. Ault, Addison. J. Chem. Educ. 1999, 76, 936.
Equilibrium 
Acids / Bases 
Aqueous Solution Chemistry 
Learning Theories 
Chemometrics 
BrønstedLowry Acids / Bases

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

Spreadsheet titration of diprotic acids and bases Breneman, G. L.; Parker, O. J. 133. Bits and pieces, 47. A spreadsheet and chart, set up using Excel, for showing titration curves of any diprotic acid or base is described. Breneman, G. L.; Parker, O. J. J. Chem. Educ. 1992, 69, 46.
Acids / Bases 
Chemometrics 
Titration / Volumetric Analysis

Chemical equilibrium: III. A few math tricks Gordus, Adon A. The third article in a series on chemical equilibrium that considers a few math "tricks" useful in equilibrium calculations and approximations. Gordus, Adon A. J. Chem. Educ. 1991, 68, 291.
Acids / Bases 
Equilibrium 
Chemometrics 
Titration / Volumetric Analysis

The acidbase package: A collection of useful programs for protontransfer systems Hawkes, Stephen J. Four programs that deal with the types of acidbase calculations normally encountered in introductory and analytical chemistry courses. Hawkes, Stephen J. J. Chem. Educ. 1989, 66, 830.
Acids / Bases 
Chemometrics

Chemistry according to ROF (Fee, Richard) Radcliffe, George; Mackenzie, Norma N. Two reviews on a software package that consists of 68 programs on 17 disks plus an administrative disk geared toward acquainting students with fundamental chemistry content. For instance, acids and bases, significant figures, electron configuration, chemical structures, bonding, phases, and more. Radcliffe, George; Mackenzie, Norma N. J. Chem. Educ. 1988, 65, A239.
Chemometrics 
Atomic Properties / Structure 
Equilibrium 
Periodicity / Periodic Table 
Periodicity / Periodic Table 
Stoichiometry 
Physical Properties 
Acids / Bases 
Covalent Bonding

Why isn't my rain as acidic as yours? Zajicek, O. T. Calculating of pH values of acid rain and comparisons to uncontaminated samples. Zajicek, O. T. J. Chem. Educ. 1985, 62, 158.
Acids / Bases 
Atmospheric Chemistry 
pH 
Chemometrics

Empirical pKb and pKa for nonmetal hydrides from periodic table position Bayless, Philip L. The equation in this article was developed by the author. It estimates the aqueous pKa for certain acids to an average deviation of 0.1pK unit for those with experimentally determined values and agrees with experimentally determined values, and as well as with estimates for those too weak or too strong to be measured. Bayless, Philip L. J. Chem. Educ. 1983, 60, 546.
Acids / Bases 
pH 
Chemometrics

Titration calculations a problemsolving approach Waddling, Robin E. L. This author shares a strategy for helping students who might be struggling with understanding how to calculate and understand titration data. Waddling, Robin E. L. J. Chem. Educ. 1983, 60, 230.
Acids / Bases 
Titration / Volumetric Analysis 
Chemometrics

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

Buffers Gold, Marvin A demonstration based on buffer calculations. Gold, Marvin J. Chem. Educ. 1982, 59, 155.
Acids / Bases 
Chemometrics

Dissociation of a weak acid Ladd, M. F. C. An earlier treatment of the equilibrium of a weak acid in water gives, for certain ranges of concentration, significantly incorrect results. Ladd, M. F. C. J. Chem. Educ. 1980, 57, 669.
Acids / Bases 
Aqueous Solution Chemistry 
Equilibrium 
Chemometrics

Intuitive and general approach to acidbase equilibrium calculations Felty, Wayne L. The purpose of this paper is to show that the usual intuitive approach used in general chemistry can be readily extended without introduction of additional, sophisticated concepts to give the general, exact expression and to point out the pedagogical advantage of its use. Felty, Wayne L. J. Chem. Educ. 1978, 55, 576.
Acids / Bases 
Equilibrium 
Chemometrics

Chemical predictions from pKa values Hassanali, A. The problem presented here develops student understanding of both pKa calculations and organic acids. Hassanali, A. J. Chem. Educ. 1978, 55, 378.
Acids / Bases 
pH 
Chemometrics

Teaching the method of successive approximations Nassiff, Peter J.; Boyko, E. R. The purpose of this papers is to help the teacher show the student why basic methods of successive approximations work, how they may be applied, and under what conditions it will be successful. Nassiff, Peter J.; Boyko, E. R. J. Chem. Educ. 1978, 55, 376.
Chemometrics 
Acids / Bases 
Gases

A criterion for the simple approximation in dissociation equilibria Leffler, Amos J. The author demonstrates quantitative criterion for the assumption that permits the neglect of the amount of dissociated species in the denominator of the dissociation equation. Leffler, Amos J. J. Chem. Educ. 1976, 53, 460.
Acids / Bases 
Equilibrium 
Chemometrics

An interactive program for teaching pH and logarithms Eskinazi, Jak; Macero, Daniel J. A computer program written in APL for teaching students logarithms and pH calculations. Eskinazi, Jak; Macero, Daniel J. J. Chem. Educ. 1972, 49, 571.
pH 
Acids / Bases 
Chemometrics

Acidbase reaction parameters Freiser, Henry The author demonstrates how the combined algebraic graphical approach can be extended to acidbase titration curve calculations as well as to buffer and sharpness index formulation. Freiser, Henry J. Chem. Educ. 1970, 47, 809.
Acids / Bases 
pH 
Titration / Volumetric Analysis 
Chemometrics

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

Circular slide rule conversion of pH to [H+] Grimm, Larry C. This short note discusses the use of a circular slide rule to convert pH to [H+]. Grimm, Larry C. J. Chem. Educ. 1969, 46, 22.
Chemometrics 
Acids / Bases 
pH 
Aqueous Solution Chemistry

Computer program for the calculation of acidbase titration curves Emery, Allan R. Describes the development of a computer program for the calculation of acidbase titration curves. Emery, Allan R. J. Chem. Educ. 1965, 42, 131.
Titration / Volumetric Analysis 
Acids / Bases 
Aqueous Solution Chemistry 
Chemometrics

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 
BrønstedLowry Acids / Bases

Solubility and pH Calculations (Butler, James N.) Ramette, R. W.
Ramette, R. W. J. Chem. Educ. 1964, 41, A970.
Aqueous Solution Chemistry 
Precipitation / Solubility 
pH 
Acids / Bases 
Chemometrics 
Enrichment / Review Materials

An approach to complex equilibrium problems Butler, James N. Presents an approach to equilibrium problems that sets up enough equations relating the various concentrations present to define the system completely and then makes approximations that simplify the equations. Butler, James N. J. Chem. Educ. 1961, 38, 141.
Equilibrium 
Chemometrics 
Acids / Bases 
Aqueous Solution Chemistry

A general equation for approximate hydronium ion calculations Drenan, James W. Presents a general equation for simplifying calculations of the hydronium ion. Drenan, James W. J. Chem. Educ. 1955, 32, 36.
Acids / Bases 
Aqueous Solution Chemistry 
pH 
Chemometrics

A log table for pH problems Condon, Francis E. Provides a readily remembered log table suitable for computing pH from hydroniumion concentration and the reverse. Condon, Francis E. J. Chem. Educ. 1954, 31, 323.
pH 
Chemometrics 
Acids / Bases 
Aqueous Solution Chemistry

