Explain Gas Eudiometry

Gas Eudiometry

The realtionship amongst gases, when thay react with one another, is goverened by two laws, namely Gay-Lussac law and Avagadro's law.

Gaseous reactions for investigation purposes are studied in a closed graduated tube open at one end and the other closed end of which is provided with platinum terminals for the passage of electricity through the mixture of gases. Such a tube is known as Eudiometer tube and hence the name Eudiometry also used for Gas analysis.

During Gas Analysis, its Eudiometer tubed filled with mercury is inverted over a trough containing mercury. A known volume of the gas or gaseous mixture to be studied is next introduced, which displaces an equivalent amount of mercury.

The following reactions among gases can be drawn:

• Volume-Volume relationship amongst gases or simple Gaseous reactions.

• Composition of Gaseous mixtures.

• Molecular formulae of gases

• Molecular formulae of Gaseous Hydrocarbons

The various reagents used for absorbing different gases are

O₃ → turpentine oil

O2 → alkaline pyrogallol

NO → FeSO₄ Sol.

CO₂, SO₂ → alkali Sol. (NaOH, KOH, Ca(OH)₂, HOCH₂CH₂NH₂, etc.)

NH₃ → acid Sol. or CuSO₄ Sol.

Cl₂ → water