Electrolysis

Phosphating of aluminium

Electrolysis of sodium hydroxide solution and preparation ofsodium by molten-salt electrolysis

Electrolysis of acids

Electrolytic deposition and quantity of electricity (Fara-day's first law)

Molten-salt electrolysis of lead chloride

Faraday's laws

Principle

Passing an electric current through a solution can cause chemical reactions. Here the current is the driving force of the redox reactions that occur.
If ions are added to water to make it conductive and that water is then electrolysed, hydrogen collects at ...

Molten-salt electrolysis

Principle

The electrolysis of molten sodium chloride to obtain chlorine and sodium, which can be further processed to produce sodium hydroxide, is an important industrial-scale process. The experiment depicted here can be used for a simple demonstration of the i ...

Electrolysis

Principle

The characteristic curve of current against voltage of an electrolytic bath containing copper sulphate solution and having copper electrodes is measured. Visible changes in the electrodes and the bath are observed.

Tasks

Transference numbers

Principle

Cations and anions contribute to charge transport in electrolytic processes in accordance with their different mobilities in an electric field. Hittorf transport numbers characterise the fraction of the total charge transported by a particular ion during electrolysi ...

Precipitation titration (with Cobra3 Basic-Unit)

Principle

Precipitation reactions which occur stoichiometrically and rapidly, and whose equilibrium lies on the side of the poorly soluble products can also be used titrimetrically. Consequently, a solution which contains both chloride and iodide ions can be titrated with a s ...

Determination of Faraday's constant

Principle

Faraday's laws of electrolysis describe the correlation between the amounts of substances transformed in the reactions at the electrodes and the charge applied (amount of electricity). Faraday's constant, which appears as a proportionality factor, can ...

Electrogravimetric determination of copper

Principle

Electrogravimetry is an important analytical method for the quantiative determination or separation of species in solution. The technique involves the quantiative electrolytic deposition of an element, usually a metal, on a suitable electrode in weigh ...

Electrolysis

Tasks

Measure the characteristic curve of current against voltage of an electrolytic bath containing copper sulphate solution and having copper electrodes. Observe visible changes in the electrodes and the bath.