Conductivity

Water quality - contamination with heavy metals

Principle

Heavy-metal ions may be carried into surface or ground water from mining fields or via the waste water of galvanicor similar production sites. They block the effect of enzymes so that the processes in the metabolism of the organisms that are controlle ...

Electrical conductivity of aqueous solutions

Charge transport in solids

Principle

Measuring the temperature dependence of the resistivity of solids provides information on the mechanism of conduction and charge transport in solids.

Tasks

Determine the temperature coefficient of iron wire, copper ...

Charge transport in liquids (Drying oven required!) (with the Cobra3 Basic-Unit)

Principle

A potential difference between two electrodes in a liquid causes the flow of a current in the liquid. This current depends on the potential drop across the liquid and its conductivity. The measurement of the conductivity of electolyte solutions yields knowledge abou ...

Charge transport in liquids (Drying oven required!) (withthe Cobra3 Chem-Unit)

Principle:

A potential difference between two electrodes in a liquid causes the flow of a current in the liquid. This current depends on the potential drop across the liquid and its conductivity. The measurement of the conductivity of electolyte solutions yield ...

Temperature dependence of conductivity (with the Cobra3 Basic-Unit)

Principle

The electrical conductivity of an electrolytic solution is dependent not only upon the type and concentration of the electrolytes, but also other state values. Thus, an increase in conductivity is generally observed with an increase in temperature. This is fundament ...

Temperature dependence of conductivity (with the Cobra3 Chem-Unit)

Principle

The electrical conductivity of an electrolytic solution is dependent not only upon the type and concentration of the electrolytes, but also other state values. Thus, an increase in conductivity is generally observed with an increase in temperature. This is fundament ...

Conductivity of strong and weak electrolytes (with the Cobra3 Basic-Unit)

Principle

It is possible to differentiate between strong and weak electrolytes by measuring their electrical conductance. Strong electrolytes follow Kohlrausch's law, whereas weak electrolytes are described by Ostwald's dilution law. The examination of the concentration depen ...

Conductivity of strong and weak electrolytes (with the Cobra3 Chem-Unit)

Principle

It is possible to differentiate between strong and weak electrolytes by measuring their electrical conductance. Strong electrolytes follow Kohlrausch's law, whereas weak electrolytes are described by Ostwald's dilution law. The examination of the concentration depen ...

Conductivity titration (with the Cobra3 Chem-Unit)

Principle

The electric conductivity of aqueous electrolyte solutions is determined by the type and number of charge carriers at constant temperature. Characteristic changes in conductivity are connected with changes in the ionic composition of reacting systems. These c ...

Determination of the activity coefficient by a conductivity measurement

Principle

The equivalent conductivity of strong electrolytes depends on their concentration. The quotient of the equivalent conductivity at a certain concentration and the equivalent conductivity at infinite dilution is called the conductivity coefficient, which is tthe resu ...