Publication in the Diário da República: Despacho nº 7835/2019 de 05/09/2019
7 ECTS; 1º Ano, 2º Semestre, 45,0 PL + 15,0 TP , Cód. 60806.
Lecturer
- Marco António Mourão Cartaxo (2)
- Valentim Maria Brunheta Nunes (1)(2)
(1) Docente Responsável
(2) Docente que lecciona
Prerequisites
Not applicable.
Objectives
Students should acquire the fundamentals of volumetric, gravimetric, potentiometric, conductimetric, and even chromatographic analytical methods. They should be able to identify and use these methods in qualitative and quantitative analysis and in quality control.
Program
1. Introduction. Qualitative and quantitative analytical chemistry. Classification of analytical methods. Solutions and concentration units. Preparation and dilution of solutions.
2. Acid-base volumetry. Acid-base titrations. Acid-base indicators. Primary and secondary standards. Strong acid - strong base and weak acid - weak base titrations. Titration curves.
3. Potentiometry. Potentiometric cells. Indicator and reference electrodes. The combined glass electrode. pH determination. Potentiometric titrations. Determination of the equivalence point.
4. Precipitation volumetry. Methods based on silver nitrate. Detection of the equivalence point. Mohr, Volhard, and Fajans methods.
5. Gravimetric analysis. Gravimetry by precipitation. Precipitating agents. Calculations in gravimetric analysis.
6. Oxidation-reduction volumetry. Redox reactions. Galvanic cells. Electrode potentials. Redox titrations. Permanganometry. Other systems. Titration curves.
7. Complexometric titration. Formation of complexes. EDTA complexes with metal ions. Other complexing agents. Complexometric titrations. Titration curves.
8. Conductimetry. Conductivity and molar conductivity. Variation with concentration. Kohlrausch's law. Conductimetric analysis methods.
9. Chromatography. Classification of chromatographic techniques. Thin-layer chromatography. Column chromatography. Gas chromatography. Liquid chromatography. Applications in chemical analysis.
Practical work:
TP1. Volumetric and potentiometric titrations of a strong acid with a strong base.
TP2. Volumetric and potentiometric titrations of a polyprotic acid (H3PO4).
TP3. Determination of chloride content in water by precipitation titration.
TP4. Determination of calcium and magnesium content in water.
TP5. Study of the conductivity of solutions of a strong electrolyte.
TP6. Studies of Separation and Identification of Compounds by TLC.
Evaluation Methodology
The assessment will consist of a written test weighted at 50%, the completion of worksheets for each assignment, and the preparation of two detailed reports on the practical work carried out in class (50%). A minimum grade of 10 points is required to pass. This methodology applies to all assessment periods. Students must complete at least 2/3 of the practical assignments to pass.
Bibliography
- Christian, D. (2013). Analytical Chemistry. New York: John Wiley&Sons
- Crouch, S. e Holler, F. e West, D. e Skoog, D. (2013). Fundamentals of Analytical Chemistry. San Francisco: Thomson Brooks/Cole
- Gonçalves, M. (2001). Métodos Instrumentais para Análise de Soluções: análise Quantitativa. Lisboa: Fundação Calouste Gulbenkian
Teaching Method
Theoretical and practical lectures with presentations and problem-solving exercises. Laboratory classes for applying various methods of chemical analysis.
Software used in class
Not applicable.
