A voltaic electrochemical cell is constructed using the following reaction. The half-cell components are separated by a salt bridge.
Enter the reaction that takes place at the anode. Include state symbols:
Enter the reaction that takes place at the cathode. Include state symbols:
In the external circuit, electrons migrate _____fromto the Zn electrode _____fromto the Fe 3+ , Fe 2+ electrode.
In the salt bridge, anions migrate _____fromto the Zn compartment _____fromto the Fe 3+ , Fe 2+ compartment.
Solution
The reaction that occurs at the anode:
Zn = Zn 2+ + 2 e - because at anode oxidation takes place and oxidation is loss of electrons
The reaction that occurs at the cathode:
Fe 3+ + e - = Fe 2+ because reduction occurs at cathode and gain of electrons is reduction.
Now 2 electrons from Zn electrode will be balanced by two ions of Fe 3+ losing one electron each.
The electrons migrate from anode to cathode in the external circuit i.e. from Zn electrode to Fe electrode because release of electrons occur at anode causing the electron flow towards cathode and completing the circuit.
The anions migrate from cathode to anodein the salt bridge.
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A voltaic electrochemical cell is constructed using the following reac.docx
1. A voltaic electrochemical cell is constructed using the following reaction. The half-cell
components are separated by a salt bridge.
Enter the reaction that takes place at the anode. Include state symbols:
Enter the reaction that takes place at the cathode. Include state symbols:
In the external circuit, electrons migrate _____fromto the Zn electrode _____fromto the Fe 3+ ,
Fe 2+ electrode.
In the salt bridge, anions migrate _____fromto the Zn compartment _____fromto the Fe 3+ , Fe
2+ compartment.
Solution
The reaction that occurs at the anode:
Zn = Zn 2+
+ 2 e -
because at anode oxidation takes place and oxidation is loss of electrons
The reaction that occurs at the cathode:
Fe 3+
+ e -
= Fe 2+
because reduction occurs at cathode and gain of electrons is reduction.
Now 2 electrons from Zn electrode will be balanced by two ions of Fe 3+
losing one electron
each.
The electrons migrate from anode to cathode in the external circuit i.e. from Zn electrode to Fe
electrode because release of electrons occur at anode causing the electron flow towards cathode
and completing the circuit.
The anions migrate from cathode to anodein the salt bridge.
