Gas Analysis

Gas Analysis
Gaseous reactions are carried out in a special type of tube known as an eudiometer tube. The tube is graduated in millimetres for volume measurement. The reacting gases taken in the eudiometer tube are exploded by sparks, produced by passing electricity through the platinum terminals provided in the tube. The volumes of the products of a gaseous explosion are determined by absorbing them in suitable reagents, e.g., Carbon dioxide and sulphur dioxide are absorbed in KOH solution, Oxygen is absorbed in a solution of alkaline pyrogallol, Water vapour produced during the reaction changes to liquid on cooling, the volume of water is neglected, but while applying POAC, moles of Water produced cannot be neglected.
Eudiometry is mainly based on Avogadro.s law, which states that equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules. Two gases having equal number of applied in solving the problems of this chapter, keeping in mind that in a gaseous reaction the relative volumes of each reactant and product represent their relative numbers of moles.