Study Guide for Chem 2222

Introductory Quantitative Analysis

Part 4. Complexation and Oxidation-Reduction

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Topic Lecture Notes and Reference Materials Reading/Study Assignment
4A. Complexation in Chemical Analysis

Complexometric Titrations I. Metal complexes, stepwise formation constants, the chelate effect, metal complex distribution diagrams. Titrations with EDTA, metallochromic indicators, the determination of water hardness.

Ch 15, Complexation and Precipitation Titrations. Sections A, B-1. Most of section B deals with precipitation titrations, which we will not cover. Review questions 1, 3, 4, 5. Problem Set 7.

Review stepwise equilibrium constants, Section 4B and Appendix 3.

Complexometric Titrations II. Effect of pH on EDTA titrations, conditional formation constants.

 Ch 15, section D. Problems 10, 11, 13*, 14*, 16*, 22, 24, 26*, 29, 30, 32*, 34*, 38* (*special emphasis).
4B. Redox Titrations

Redox I. Fundamental of electrochemistry. Electrode potentials and electrochemical cells, schematic representation of cells, predicting redox reactions from electrode potentials.

Lecture notes (ppt) on electrode potentials, electrochemical cells, and the Nernst equation.

Ch 16, sections A, B, C1-C4. Review questions #1-5, excercises 7,8, 11.

Problem Set 8.

Quiz on redox reactions.

Redox II. Nernst equation. Electrodes involving slightly soluble salts and complex ions. Calculation of cell potentials.

Ch 16, sections C5-C7. Exercises 13, 16, 18, 20, 24, 27.

Ch 17, section A, B. Problems 1, 6, 8-10.
4C. Potentiometric Titration Curves

Redox III. Redox titration curves and redox indicators.

Lecture notes (ppt) on potentiometric titrations.

Ch 17, sections C-E. Problems 11-15.

Not included Spring 2008
4D. Potentiometry and pH

Redox V. Potentiometric methods. Reference and indicator electrodes. The glass electrode and measurement of pH.

Lecture notes (ppt) on potentiometric methods.

Examples:

  • Potentiometric determination of chromate with a silver-silver chromate electrode (pdf) (mcd)
  • Calculation of pH from cell potentials (pdf) (mcd)
 Ch 19, sections A-C, D1-D3, F4, G1. Problems 1, 4, 5, 7, 8, 12, 20, 21. Problems 20 and 21 are illustrated in the linked examples at left. For problem 21, note corrections to text.
  Review Complexation and Redox  

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