Analytical Chemistry

CHE 401 : ANALYTICAL CHEMISTRY




MODULE
2
CALCULATIONS USED IN ANALYTICAL CHEMISTRY



INTRODUCTION
This module describes the methods that are being used to compute the results of quantitative
analysis. The SI system of units and the distinction between mass and weight were presented. The
discussion of the mole and the various ways the concentrations are expressed will be discussed.
The students will learn to do stoichiometry and understand how it is important in analytical
calculations. At the end of the module, the student will be familiar with the terms and calculations
to be use in the analysis.


INTENDED LEARNING OUTCOMES
At the end of the module, the following learning outcomes are expected to be acquired by the
students:
1. Understand the concepts and be familiar with the steps and techniques employed in
gravimetric and volumetric method of analysis.
2. Acquire skills in laboratory technique required to perform and plan chemical analysis and
systematically collect and interpret data obtained in quantitative analytical process.


CONTENT OVERVIEW
Indicative contents included the following topics:
1. Unit of measurements
2. Distinction between mass and weight
3. Mole and millimole
4. Methods of expressing concentrations
5. Chemical stoichiometry


END OF THE MODULE TEST
The following are the assessment provided to evaluate students level of understanding after the
discussion of the modules:

Coursework (10 pts )
Problems involving calculations in analytical chemistry.

, CHE 401 : ANALYTICAL CHEMISTRY




Table of Contents
MODULE 2. CALCULATIONS USED IN ANALYTICAL CHEMISTRY ............................................. 3
2.1 UNITS OF MEASUREMENTS ................................................................................................. 3
2.2 DISTINCTION BETWEEN MASS AND WEIGHT .................................................................. 4
2.3 MOLE AND MILLIMOLE ........................................................................................................ 5
2.4 METHODS OF EXPRESSING CONCENTRATIONS .............................................................. 6
2.4.1 Molar concentration ................................................................................................................ 6
2.4.2 Molal concentration ................................................................................................................ 8
2.4.3 Normal concentration .............................................................................................................. 8
2.4.4 Percent concentration .............................................................................................................. 9
2.4.5 Parts per million and parts per billion ..................................................................................... 9
2.4.6 Solution-diluent ratio ............................................................................................................ 10
2.4.7 P-Functions ........................................................................................................................... 10
2.4.8 Density and specific gravity .................................................................................................. 11
2.5 CHEMICAL STOICHIOMETRY............................................................................................. 12
2.6 END OF MODULE TEST ........................................................................................................ 15