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The Teaching of Precipitation Equilibrium: A New Approach
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Abstract
In this paper we present a simplified integrated approach to the calculation of the solubility in water of a salt, and the pH of the saturated solution, taking into account the acid-base reactions of the anion. A classification of the salt, based upon the values of the appropriate equilibrium constants, is done with the help of a decision tree. This classification is used as a guide for the identification of the assumptions that have to be made to obtain a set of easily resolvable equations. The application of the method is discussed with examples.
Keywords (Audience):
First-Year Undergraduate / GeneralKeywords (Domain):
Inorganic ChemistryKeywords (Subject):
Precipitation / SolubilityCiting Articles
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This article has been cited by 6 ACS Journal articles (5 most recent appear below).
Constructing a Graphic Organizer in the Classroom: Introductory Students' Perception of Achievement Using a Decision Map To Solve Aqueous Acid–Base Equilibria Problems
Stephen DeMeoJournal of Chemical Education2007 84 (3), 540Constructing a Graphic Organizer in the Classroom: Introductory Students' Perception of Achievement Using a Decision Map To Solve Aqueous Acid–Base Equilibria Problems
Stephen DeMeoJournal of Chemical Education2007 84 (3), 540Common examples of graphic organizers include flow diagrams, concept maps, and decision trees. The author has created a novel type of graphic organizer called a decision map. A decision map is a directional heuristic that helps learners solve problems ...
Using Limiting-Excess Stoichiometry to Introduce Equilibrium Calculations: A Discrepant Event Laboratory Activity Involving Precipitation Reactions
Stephen DeMeoJournal of Chemical Education2002 79 (4), 474Using Limiting-Excess Stoichiometry to Introduce Equilibrium Calculations: A Discrepant Event Laboratory Activity Involving Precipitation Reactions
Stephen DeMeoJournal of Chemical Education2002 79 (4), 474The transition between limiting and excess stoichiometry and equilibrium calculations is demonstrated in a laboratory activity for introductory college chemistry students. Students are presented with two precipitation reactions and asked to predict the ...
Evaluating Solubility of Sparingly Soluble Diprotic Acid Salts
Jean M. NigrettoJournal of Chemical Education2001 78 (5), 631Evaluating Solubility of Sparingly Soluble Diprotic Acid Salts
Jean M. NigrettoJournal of Chemical Education2001 78 (5), 631Students often feel it is arduous to conduct solubility calculations owing to the apparent difficulty of dealing with the presence of a solid phase that is ignored in the mass balance. This is especially true when they have to calculate the pH of ...
Spreadsheet Techniques for Evaluating the Solubility of Sparingly Soluble Salts of Weak Acids
José L. Guinón , José García-Antón and Valentín Pérez-HerranzJournal of Chemical Education1999 76 (8), 1157Spreadsheet Techniques for Evaluating the Solubility of Sparingly Soluble Salts of Weak Acids
José L. Guinón , José García-Antón and Valentín Pérez-HerranzJournal of Chemical Education1999 76 (8), 1157A spreadsheet of Microsoft Excel for determining the solubility of sparingly soluble salts is described. The chart and worksheet are shown simultaneously on the screen. The worksheet can be used for any salt by merely changing the data for the solubility ...
Graphing Calculator Strategies for Solving Chemical Equilibrium Problems
Henry Donato Jr.Journal of Chemical Education1999 76 (5), 632Graphing Calculator Strategies for Solving Chemical Equilibrium Problems
Henry Donato Jr.Journal of Chemical Education1999 76 (5), 632Polynomial equations arising from analysis of the chemical equilibrium state present computational difficulties for many introductory chemistry students. A general method for finding the roots of these polynomial equations using the ubiquitous and ...
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- Received: August 03, 2009
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