Frequently Asked Questions about Galvanic Cells
What is a Galvanic Cell?
A Galvanic cell (also known as a voltaic cell) is an electrochemical cell that derives electrical energy from spontaneous redox reactions taking place within the cell. It consists of two different metals connected by a salt bridge or a porous disk.
How is Cell Potential Calculated?
The standard cell potential (E°cell) is calculated using the formula: E°cell = E°cathode - E°anode. If concentrations differ from 1M, the Nernst Equation is used to find the cell potential under non-standard conditions.
What is the function of the Salt Bridge?
The salt bridge maintains electrical neutrality within the internal circuit. It allows ions to flow between the oxidation and reduction half-cells, preventing charge buildup that would otherwise stop the reaction.
Why does the anode lose mass?
At the anode, oxidation occurs, meaning metal atoms lose electrons and dissolve into the solution as positive ions. This process effectively consumes the metal electrode over time, reducing its mass.