A voltaic cell is constructed in which the anode is a Mg | Mg 2+ half cell and t
ID: 586857 • Letter: A
Question
A voltaic cell is constructed in which the anode is a Mg|Mg2+ half cell and the cathode is a Zn|Zn2+ half cell. The half-cell compartments are connected by a salt bridge.
(Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
The anode reaction is:
The cathode reaction is:
The net cell reaction is:
In the external circuit, electrons migrate _____fromto the Mg|Mg2+ electrode _____fromto the Zn|Zn2+ electrode.
In the salt bridge, anions migrate _____fromto the Mg|Mg2+ compartment _____fromto the Zn|Zn2+ compartment.
Explanation / Answer
anode reaction
Mg(s) ------------------------>Mg^2+ (aq) + 2e^- oxidation half cell reaction
cathode reaction
Zn^2+ (aq) + 2e^- ------------> Zn(s) reduction half cell reaction
Mg(s) ------------------------>Mg^2+ (aq) + 2e^-
Zn^2+ (aq) + 2e^- ------------> Zn(s)
----------------------------------------------------------
Mg(s) + Zn^2+ (aq) --------------> Mg^2+ (aq) + Zn(s) net cell reaction
In the external circuit, electrons migrate anode from the Mg|Mg2+ electrode to cathode the Zn|Zn2+ electrode.
In the salt bridge, anions migrate anode from Mg|Mg2+ compartment to the Zn|Zn2+ compartment.
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