771106 Practical course in instrumental analytical and physical chemistry


Type
Exercise course
Semester hours
6
Lecturer (assistant)
Organisation
Offered in
Wintersemester 2020/21
Languages of instruction
Deutsch

Content

Classical quantitative analysis:
Acid-base titrations (water hardness, ammonium resp. nitrogen determination using the Parnas-Wagner method (distillation apparatus)
Complexometric titrations (water hardness, phosphate (back titration))
Redox titrations (oxalate, iron, vitamin C)

Instrumental (physical) quantitative analysis:
Electrochemical methods: conductometry and potentiometry for indication of titrations, determination of the molar mass and pKS–values of amino acids
Spectroscopy: UV-Vis photometry (iron, determination of the pKS–value of an acid-base indicator)

Separation techniques:
Thin layer chromatography (vitamins), ion chromatography (anions)

Assessment of measured values and obtained results:
significant figures, measurement uncertainty

Previous knowledge expected

Requirements: Course 771105 Practical Course in Classical Analytical Chemistry, laboratory examination for course 771106 Practical Course in Instrumental Analytical and Physical Chemistry as well as the lecture/exercise 771118 Calculation in Chemistry I or (alternatively) laboratory examination Calculation in Chemistry.

Objective (expected results of study and acquired competences)

The correct behaviour, the safe handling of chemicals and instruments are now a matter of course since passing 771102 and 771105 that allows the students to concentrate on the analysis and new methods to apply.
After successful attendance of this course, the students are familiar with practical and theoretical basics of quantitative and instrumental chemical analysis.
They are able to start running and handle different instrumentations, such as distillation equipment and analytical instruments (potentiometer, conductometer, photometer, ion chromatograph) by themselves, as well as to perform precise quantitative analysis according to detailed operating procedures. They are able to perform complex calculations and to compose comprehensive protocols.
Besides producing buffer solutions they have adjusted the pH values of these solutions to a given value and therefore they know to produce buffer solutions with defined pH values by themselves.
They are able to perform different titrations such as acid-base titrations, precipitation titrations, complexometric titrations, redox titrations, and they know the specifics of these titration types such as endpoint detection with indicators and indication by instrumental methods (conductometry, potentiometry).
The professional handling of a balance is a matter of course and the possible errors and the kind of errors are well-known by the students.
Now they are able to calibrate analytical instruments (pH meter, photometer, ion chromatograph) self-dependent and to determine the concentrations of analytes, starting from calculating the necessary initial weight of a reference substance and the required dilution steps to the point of quantification of the content of these analytes in the samples.
The students can perform simple and even more complex chromatographic separations (thin layer chromatography, ion chromatography) and are familiar with different detection methods of the separated components. They know how accurate and precise the used methods are, and how precise the obtained results can be reported (significant figures).
Thus, based on the knowledge about indication and assessment of measuring results (significant figures, measurement uncertainty), the students are able to assess if a certain method fulfills the accuracy and precision required by an analytical problem. Therefore they are able to decide if a method is suitable for a given task and they can recommend their usage. The students are able to substantiate why a method is presumably not appropriate.
Furthermore, the students are able to plan similar analysis self-dependently, because they have learned to take care of the necessary means (samples, instruments ...) in time to have them available on the day of analysis.
You can find more details like the schedule or information about exams on the course-page in BOKUonline.