Galvanic (Voltaic) cell
A galvanic cell is the supply of direct current (DC) consists of two half-cells. These two half-cells are physically separated. Each half-cell consists of an electrode that is conductive metal or graphite strip in contact with an electrolyte solution. Those solutions are joined by a salt bridge containing an electrolytic solution like Potassium Nitrate (KNO3). The salt bridge completes the circuit and permits ions to travels between two half-cell.
The electrode where the oxidation reaction (Loss of electrons) takes place is termed the anode. As electrons are released by oxidation, the terminal of the anode is marked negative (-). The electrode where reduction reaction takes place is termed the cathode. As a result of the cathode accepting electrons the reduction reaction (Gain of electrons) is presented, the terminal of the cathode is marked positive (+).
Mn+ (oxidized agent) + n e− → M (reduced agent)
Although oxidation-reduction reactions, also known as Redox reaction, occur simultaneously in galvanic cell to produce electricity. It's more convenient to think about the oxidation and reduction processes separately. The two half-reactions are represented by two half-equations, one for the oxidation reaction and another is the reduction reaction. The quantity of electrons transferred in each direction should be an equivalent, therefore the two half-cells are combined to grant the whole-cell electrochemical reaction.
Example of Oxidation- Reduction (Redox) reaction:
The reaction between zinc and hydrochloric acid
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
The zinc losses electrons and is oxidized to form zinc ions
Oxidation: Zn(s) → Zn2+(aq) + 2e-
And the hydrogen ions from the hydr...
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1. Felicia Dye, what is a Silver-oxide battery? Edited by C. Wilborn, 2003-2011 Conjecture Corporation ,Acceded on 12/11/2011
2. Tower Hobbies®,Batteries-Dry cell prize list ,Acceded on 13/11/2011
3. Charles Sturt University, Extract from Chemistry Stage 6 syllabus (Amended October 2003.) © Board of Studies, NSW, Edited 30 June 11, New HSC Online,Acceded on 12/11/2011
4. The Teleosis institute, The hazard of mercury, Acceded on 12/11/2011
1. Debbie Irwin, Ross Farrelly, Deborah Vitlin & Patrick Garnett, reprinted 2003, Chemistry Contexts 2, Pearson Education Australia Pty Limited, PP. 74-76.
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