Electrochemistry
Galvanic (Voltaic) Cells
Components of a Galvanic Cell
1- Half-cells - One half of the galvanic cell (e.g. the oxidation half-cell or the reduction half-cell).
2- Anode - Electrode at which oxidation takes place.
3- Cathode - Electrode at which reduction takes place.
4- Salt Bridge - Connecting the two half-cells.
The cations, positive ions, flow toward the cathode to replace the cations that are being picked up at the electrode.
The anions, negative ions, flow toward the anode to balance the positive charge of the cations that are released from the electrode.
5- A device to detect the amount of current flowing through the cell (in volts).
A battery is an example of a galvanic cell.
What's Happening in the Galvanic Cell Above??
The zinc electrode is losing mass as Zn metal is oxidized to Zn2+ ions which go into solution.
The concentration of the Zn2+ solution is increasing.
Anions, negative ions (e.g. Cl-), are flowing from the salt bridge
toward the anode to balance the positive charge of the Zn2+ ions
produced.
The copper electrode is gaining mass as Cu2+ ions in the solution are
reduced to Cu metal. The concentration of the Cu2+ solution is
decreasing.
Cations, positive ions (e.g. K+), are flowing from the salt bridge
toward the cathode to replace the positive charge of the Cu2+ ions that
consumed.
Remember the following:
RED CAT & AN OX
REDuction occurs at the CAThode
OXidation occurs at the ANode
وانتظرواااااااااااا البقيه .............................
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Galvanic (Voltaic) Cells
Components of a Galvanic Cell
1- Half-cells - One half of the galvanic cell (e.g. the oxidation half-cell or the reduction half-cell).
2- Anode - Electrode at which oxidation takes place.
3- Cathode - Electrode at which reduction takes place.
4- Salt Bridge - Connecting the two half-cells.
The cations, positive ions, flow toward the cathode to replace the cations that are being picked up at the electrode.
The anions, negative ions, flow toward the anode to balance the positive charge of the cations that are released from the electrode.
5- A device to detect the amount of current flowing through the cell (in volts).
A battery is an example of a galvanic cell.
What's Happening in the Galvanic Cell Above??
The zinc electrode is losing mass as Zn metal is oxidized to Zn2+ ions which go into solution.
The concentration of the Zn2+ solution is increasing.
Anions, negative ions (e.g. Cl-), are flowing from the salt bridge
toward the anode to balance the positive charge of the Zn2+ ions
produced.
The copper electrode is gaining mass as Cu2+ ions in the solution are
reduced to Cu metal. The concentration of the Cu2+ solution is
decreasing.
Cations, positive ions (e.g. K+), are flowing from the salt bridge
toward the cathode to replace the positive charge of the Cu2+ ions that
consumed.
Remember the following:
RED CAT & AN OX
REDuction occurs at the CAThode
OXidation occurs at the ANode
وانتظرواااااااااااا البقيه .............................