Question

Enter electrons as e^-.

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:

__(aq)(s)(l)(g)

+

__(aq)(s)(l)(g)

----->

__(aq)(s)(l)(g)

+

__(aq)(s)(l)(g)

The cathode reaction is:

__(aq)(s)(l)(g)

+

__(aq)(s)(l)(g)

----->

__(aq)(s)(l)(g)

+

__(aq)(s)(l)(g)

The net cell reaction is:

__(aq)(s)(l)(g)

+

__(aq)(s)(l)(g)

----->

__(aq)(s)(l)(g)

+

__(aq)(s)(l)(g)

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.

Answer 1

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.