IA/0051 - CHEMISTRY LABORATORY
Academic Year 2021/2022
Free text for the University
ANNALISA VACCA (Tit.)
- Teaching style
- Lingua Insegnamento
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The main objective of the Laboratory of Chemistry course is to provide the instruments needed to carry out basic activities in a chemical laboratory. The student is required to learn not only some laboratory techniques, but also to develop, by experimental procedures, the capabilities of observation and of critical analysis. Furthermore, course aims to allow the student an experimental check of the theoretical concepts learned during the course of Chemistry.
Acquiring knowledge and understanding. At the end of the course it is expected that the students know:
- the basics of errors in a measurement and their propagation, and how to accurately report a measured value;
- who to beave to work safely in a chemical laboratory;
- how to accurately measure masses, temperatures and volumes, and how to prepare a solution;
- the procedures to make an acid-base titration and how to measure the pH of a solution;
- the equilibrium of solubility, the empirical solubility of salts in water, the precipitation phenomenon and how to solubilize or crystallize a salt;
- how to perform an electrodeposition and prepare a basic electrochemical cell.
Applying knowledge and understanding. At the end of the course it is expected that the students are able to:
- correctly report the value of a measure, directly or indirectly obtained, with the corresponding error;
- work safely in a chemical laboratory;
- measure mass, temperature and volume, prepare a solution;
- know how to measure the pH of a solution;
- accomplish procedures capable of varying the solubility of a salt in water;
- apply the principles of electrochemistry to an electrodeposition or a basic electrochemical cell.
In addition, at the end of the course the student must have acquired the ability to work in group effectively.
Making judgments. At the end of the course, the student is expected to be able to independently design, prepare and run an experiment on the topics discussed, critically evaluate the results and report them in the appropriate way
Communication. At the end of the course, it is expected that, relative to the course contents, the student has acquired the correct use of language, to allow him to be fully understood by a speaker with technical skills, and to impart the basic concepts to a speaker without technical skills.
Learning skills. At the end of the course, it is expected the student has acquired the knowledge and skills to be able to autonomously deepen his/her own knowledge in the field of applied chemistry. In addition, considering the didactic approach followed, the course allows the student to develop the ability to pass from the theoretical to the practical-experimental point of view.
Basic knowledge Mathematics and Physics, in particular logarithms, quadratic equations, units of measurement and their conversion, energy and work. In addition, is required the knowledge of chemical topics such as solutions, electrochemistry and acid-base equilibria, which will be the subject of some laboratory experiments.
1. Introduction to the error calculation (2 hours of lesson-1 hours of exercises): Significant figures; Error in an experimental measure; Absolute error and relative error; Error propagation.
2. Safety in a chemistry laboratory (2 hours of lesson-1 hour of laboratory activity): basic safety regulations and behaviors; pprotective equipment; reagent label; glassware and equipment.
3. Measurements of weight, temperature and volume (1 hour of lesson-2 hours of laboratory activity): use of a balance and mass measurement; temperature measurement; liquid’s volume measurement. Laboratory experiments on these topics.
4. Solutions preparation (1 hour of class-3 hours of laboratory activity): preparation of liquid-liquid and solid-liquid solutions at a given concentration. Laboratory experiments on these topics.
5. Solubility and crystallization (1 hour of lesson-3 hours of laboratory activity): solubility product; the empirical rules of solubility for salts in water; the phenomenon of precipitation; the effect of the temperature and that of the common-ion on the solubility of a salt. Laboratory experiments on these topics.
6. QUALITATIVE RECOGNITION OF CHEMICAL SPECIES (1 hours of lesson - 2 hours of of laboratory activity): qualitative recognition of cations and anions. Laboratory experiences related to these topics.
7. pH measurement (1 hour of lecture-4 hours of laboratory activity): acid-base titrations; use of a pH-meter for pH measurement of an aqueous solution. Laboratory experiments on these topics.
8. Electrochemistry (1 hour of lecture-4 hours of laboratory activity): electrodeposition; preparation of a basic electrochemical cell; electrochemical series. Laboratory experiments on these topics.
The course is divided into a series of lectures, combined with laboratory exercises and experiments on the topics in the program.
During the lectures the teacher will recall the theoretical aspects and describe in detail the experiments to be done in the laboratory. For the lab activities, students will be divided into groups to develop their ability to collaborate and develop a shared work. In addition, during the lab activities, the teacher will stimulate students with questions related to verify the level of attention and learning.
Laboratory activities may be changed due to COVID.
The different activities are approximately divided as follow:
Lectures: 10 hours
Exercises and of laboratory activity: 20 hours
Verification of learning
The final evaluation is based on a written test carried out at the end of the course. The test consists of 10 multiple choice questions concerning the topics discussed during the course. To pass the test, students have to receive a positive evaluation (6/10). For each question, the score is provided in the text.
R. Morassi, G. P. Speroni – “IL LABORATORIO CHIMICO” – Piccin.
The didactic material including slides of lectures and notes concerning the laboratory experiments can be downloaded from Moodle.