Acceptor half-cell

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Principle of a galvanic cell with an ion bridge

The acceptor half-cell is the half-cell in a galvanic element in which the reduction (electron uptake) of the oxidized form of a redox couple (the one with fewer electrons - mostly positively charged metal ion) to the reduced form (the one with more electrons - mostly uncharged metal atom) of the redox couple takes place.

It is connected to the donor half-cell by means of a salt bridge (ion bridge). The result is that the metal atoms attach to the electrode of the half-cell and the electrode "grows". In chemistry, positively charged ions are called cations , negatively charged anions , because they migrate in an electric field as an ion current to the cathode ("negative pole" of the field) or to the anode ("positive pole" of the field). In a solvent to a form surrounding the ion solvation shell from

The strength of an oxidizing agent can be measured by measuring the potential difference to a reference electrode. The half-cell in a galvanic element with the more negative normal potential is always the donor half-cell. The name donor comes from the fact that electrons are transferred to the other half-cell (acceptor half-cell) during oxidation.

The half-cell in a galvanic element with the more positive normal potential is always the acceptor half-cell . The name comes from the fact that during the reduction electrons are taken up (accepted) by the other half-cell (donor half-cell). In a Daniell element , the copper half-cell is the acceptor half-cell; metallic copper is deposited on the electrode of the copper half-cell .

See also

literature

  • Michael Wächter: Book of Tables of Chemistry: Data on Analytics, Laboratory Practice and Theory , John Wiley & Sons, 2012, ISBN 978-3-527-32960-1 .