Chemistry Lab II

Code:

EQ108

Acronym:

LQII

Instance: 2003/2004 - 2S

Active?	Yes
Responsible unit:	Department of Chemical and Biological Engineering
Course/CS Responsible:	Chemical Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
LEQ	108	Plano Oficial EQ a partir 2003	1	3	5,5	-

Teaching language

Portuguese

Objectives

To teach the chemistry of titrimetric analysis (acid-base, precipitation, complex and redox reactions); the students must have the proper skill to calculate chemical equilibrium concentrations for each type of titration and for situations with several types of equilibria.
Laboratory sessions aims to provide students with techniques in strict connection with the theory.

Program

Theory:
I. Acid-base equilibrium
A. Acid-base theories
B. pkw and pH
C. Strength of acids and bases. pka and pkb
D. pH determination in aqueous solution.
E. pH buffer solutions. Buffer capacity.
F. Acid-base titrations.
II. Precipitation equilibrium
A.Effects that influence the solubility
B. Precipitation titrations
III. Complexation equilibrium
A.Introdutory concepts
B.Complexes stability
C.Effects that influence complexation
D. Complexation titrations
IV. Redox equilibrium
A.Introdutory concepts
B.Electrode potentials
C.Nernst equation
D.Standard electrode potentials and chemical equilibrium constant
E. Latimer and Frost diagrams
F. Effects of other equilibria on potential
G. Pourbaix diagrams
H.Redox titrations

Lab sessions:
Several works are performed in strict connection to the theory:
I.Determination of vinegar acidity;
II.Determination of water hardness;
III.Identification and determination of halides in a sample;
IV. Preparation and standardization of a thiossulfate solution;
V. Quality control of ascorbic acid in comercial samples.

Main Bibliography

D. A. Skoog, D. M. West, F. J. Holler e S.R. Crouch, "Analytical chemistry-an introduction", Saunders College Publishing, New York, 2000.

G. H. Jeffery, J. Bassett, J. Mendham e R.C. Denney, "Análise química quantitativa- VOGEL", Editora Guanabara Koogan S.A., Rio de Janeiro, 1992.

H.M.V.M. Soares, Laboratórios de Química II - Guide to theoretical sessions, 2002 (in portuguese).

H.M.V.M. Soares, Laboratórios de Química II - Guide to laboratory sessions, 2002 (in portuguese).

Complementary Bibliography

D.C. Harris, "Quantitative Chemical Analysis", Freeman, New York, 1998;

R. de Levie, Principles of Quantitative Chemical Analysis, Mc Graw-Hill Companies, New York, 1997;

G.D. Christian, "Analytical Chemistry", Jonh Wiley and Sons, New York, 1994;

V. Alexéev, "Análise quantitativa", Lopes da Silva-Editora, Porto,2000.

Teaching methods and learning activities

THEORETICAL SESSIONS:
Oral exposition of the subjects mentioned in the program described above, supported by the blackboard and transparencies. A set of problems in strict connection with the theory are solved. Students are motivated to participate and to deduce the subjects.
LAB SESSIONS:
Students perform the experimental works described above. Methodologies used and interpretation of experimental results are discussed with the students.

Software

Excel.

Evaluation Type

Distributed evaluation without final exam

Eligibility for exams

Students should perform all experimental works and have a Lab mark equal or higher than 10 (scale out of 20).

Calculation formula of final grade

Final classification (FC) is calculated taken into account the following equation: FC=0,4L+0,6T, being L and T the final marks obtained in the lab and theoretical sessions.

Classification improvement

Students can only improve their theoretical grade in the last exam.