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Unified Approximations: A New Approach for Monoprotic Weak Acid–Base EquilibriaHarry 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 SpreadsheetsPeter 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 Acid-Base Titration Curves without CalculationsDennis 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.