Chemistry

Production of soup seasoning

Obtaining vegetable oils by extraction

Electrostatic flue gas cleaning

Model experiment on the desulphurisation of flue gas

Immobilised cells in the service of biotechnology - micro-bial synthesis of acetic acid with Acetobacter aceti

Temperature dependence of conductivity

Manual pH titration with Cobra4

Conductivity of various water samples

Velocity of molecules and the Maxwell-Boltzmann distributionfunction

Principle:

A kinetic gas theory apparatus is to be used as a model to simulate the motion of gas molecules and to determine their velocity by determining the distance that glass balls are thrown. The velocity distribution found is to be compared with the theoretical Maxwell-Bol ...

Gas viscosity: estimation of molecular diameter

Principle:

Expressed most simply, the viscosity of a fluid (liquid or gas) relates to its resistance to flow. The viscosity of a gas is determined in particular by the rate of transfer of the flow momentum from faster moving layers (laminas) to slower ones. The so-called transp ...

Diffusion in gases: the diffusion coefficient of bromine inair

Principle:

Diffusion arises from the flow of matter down a concentration gradient. In the evaporation method, a stationary concentration gradient is achieved in which the concentration decreases linearly with distance. Under these conditions the diffusion coefficient of the dif ...

Determination of the molecular mass of a liquid

Principle:

The molar mass of a liquid is to be determined by evaporating a liquid at constant temperature and pressure, and measuring the volume of  vapour  formed using a calibrated gas syring.

Tasks:

1. Determine the molar masses of diethy ...

Determining the molecular weight of a polymer from intrinsicviscosity measurements

Principle:

The viscosity of a liquid is effectively determined by the strength of the intermolecular attractive forces. In the case of solutions, the viscosity of the solvent can alter significantly depending on the type and concentration of the solute. Due to their size, macro ...

Thermal conductivity of gases

Principle:

The thermal conductivity of different gases are measured with a gas-chromatographic thermal conductivity detector under stationary conditions. The electrical measurement parameter, which is obtained as a voltage signal in the experimental set-up, is proportional to t ...

Viscosity measurements with the falling ball viscometer

Principle:

Liquids and gases have different viscosities because of the difference in the internal friction between their molecules. Viscosity is a function of the structure of a substance and its temperature. It is to be experimentally determinded here by measuring the rate of ...