Electrochemical Potentials - Electrochemical Series - pH Values

Hydrogen in the redox series: normal hydrogen electrode

The electrochemical series of metals

Determination of the isoelectric point of an amino acid(glycine) with the Basic-Unit

Automatic titration of household vinegar, complete set (interface version Cobra3 Chem-Unit)

The Nernst equation

Principle

The Nernst equation expresses how the electrical potential of an electrode in contact with a solution of ions depends upon the concentrations (more accurately, activities) of those ions. The equation may be experimentally verified using an electrochemical cell forme ...

Concentration cells without transport: Determination of thesolubility products of silver halides

Principle:

A concentration cell is constructed from two half-cells which are identical, except that the concentration of the ionic species to which the electrode is sensitive is different in the two sides of the cell. Such a cell may be used to measure the solubility product ...

Temperature dependence of the electromotive force

Principle

Thermodynamic data of the gross reaction in a galvanic cell can be determined by measuring the e.m.f. at different temperatures.

Tasks

Determine the usable reaction equivalent work of the Daniell cell by measuring t ...

Potentiometric titration (with the Cobra3 Basic-Unit)

Principle

In a potentiometric titration, the equivalence point is detected by monitoring the electromotive force (e.m.f.) of an electrochemical cell formed by an indicator electrode coupled with a convenient reference electrode. The potential of the indicator electrode, and h ...

Potentiometric titration (with the Cobra3 Chem-Unit)

Principle

In a potentiometric titration, the equivalence point is detected by monitoring the electromotive force (e.m.f.) of an electrochemical cell formed by an indicator electrode coupled with a convenient reference electrode. The potential of the indicator electrode, and h ...

Precipitation titration (with Cobra3 Chem-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 ...

pH measurement

Principle

The course, reaction rate and equilibrium position of many chemical reactions are strongly influenced by the concentration or more accurately, the activity of hydrogen ions in solutions α_H+. Rapid and accurate determinations of hydrogen ion activity ...

Titration curves and buffering capacity (with the Cobra3 Ba-sic-Unit)

Principle

pH values can be measured with the aid of electrochemical measurements and proton-sensitive electrodes (e.g. glass electrodes). By combining a glass electrode with a reference electrode in one housing, a single-rod glass electrode, which is appropriate for acid-base ...

Titration curves and buffering capacity (with the Cobra3Chem-Unit)

Principle:

pH values can be measured with the aid of electrochemical measurements and proton-sensitive electrodes (e.g. glass electrodes). By combining a glass electrode with a reference electrode in one housing, a single-rod glass electrode, which is appropriate for acid-bas ...

Potentiometric pH titration (phosphoric acid in soft drinks)

Principle

The cell voltage and the Galvani voltage of the electrodes of an galvanic cell are dependent upon the concentration of the ions involved in the potential forming process. Thus, conclusions can be made about the concentration of the ions to be investigated from the m ...

Electrode kinetics: The hydrogen overpotential of metals (with the Cobra3 Basic-Unit)

Principle

If the oxidation and reduction steps of an electrode reaction are rapid (high exchange current densities) then the passage of charge across the electrode-solution interface will barely displace the reaction equilibrium. Such an electrode is said to be non-polarisabl ...