CHIMICA ANALITICA 1 – 9 CFU Dott. Francesca Nunzi Dipartimento

CHIMICA ANALITICA 1 – 9 CFU
Dott. Francesca Nunzi
Dipartimento di Chimica - Tel. 075-5855517
e-mail: [email protected]
Program
Theoretical and practical aspects of an analytical process. Fundamental theoretical principles of
chemical reactions in solution. Steps in a typical qualitative and quantitative chemical analysis. Interferences in analytical chemistry and their treatment. Studies of the feasibility criteria of an
experimental analytical determination.
- General aspects of volumetric direct and indirect analytical processes.
- Study of the factors that govern the solubility of poorly soluble substances.
- Error associated with a measure. Precision, accuracy and reliability of an experimental result.
- Preparation of standard solutions.
- Theoretical and experimental titration curves. Mathematical equation that describes the titration
curve of a generic volumetric analytical process. Criteria to determine the equivalence point in the
symmetrical and not symmetrical theoretical and experimental titration curves.
- Titrations by precipitation.Equation titration curve and its use in analysis for precipitation.
Titration of halides according to Mohr and Fajans methods.
- Neutralization titrations. General concepts on acids and bases (Bronsted- Lowry theory). Exact
and approximate calculation of the concentration of H+ in aqueous solutions. Mathematical
equations of titration curves for strong and weak monoprotic and polyprotic acid-base systems.
- Buffering capacity and mathematical equation for the exact and approximate calculation of the buffering capacity of an aqueous solution versus pH. Study of the correlation between buffering
capacity versus pH graphs and their titration curves for complex acid-base systems. Two-colour and
appearing colour acid-base indicators.
- Conductometric and potentiometric methods for the determination of the equivalent point.
Feasibility study of experimental acid-base titrations of acid or base mono and polyfunctional
substances and of commercial products.
- Complexometric titrations
- Study of the complexation reactions for analytical applications. Use of chelating agents in
complexometric procedures (in particular EDTA). Study of the optimal experimental conditions for
the complexometric determination of a generic analyte. Metallochromic indicators. Direct, indirect,
by displacement and selective of several metals complexometric titrations.
- Oxidation-reduction titrations.
- Study of the factors that govern the redox reactions. Titration curve and the potential at the
equivalent point in redox reactions. Stability of the redox couples in aqueous solutions.
Permanganate titrations, direct and indirect iodometry.
- Conductimetry
- Measurement and study of the factors responsible for the conductance of an aqueous solution.
- Conductometric titration curves. Criteria to determine the equivalent point in conductometric
titration curves. Use of conductimetry in acid-base titrations and in titrations for precipitation.
Suggested books:
D.A. SKOOG, D.M. WEST, F.G. HOLLER, Fondamenti di Chimica analitica II edizione, EdiSES,
Napoli.
D. C. HARRIS, Chimica Analitica Quantitativa, Zanichelli, Bologna, II edizione 2005
P. LANZA, Chimica Analitica Generale, Patron, Bologna, 1992