A voltaic cell is constructed in which the anode is a Zn | Zn 2+ half cell and t

Question

A voltaic cell is constructed in which the anode is a Zn|Zn2+ half cell and the cathode is a Cd|Cd2+ half cell. The half-cell compartments are connected by a salt bridge.

The anode reaction is:

The cathode reaction is:

The net cell reaction is:

In the external circuit, electrons migrate _____fromto the Zn|Zn2+ electrode _____fromto the Cd|Cd2+ electrode.

In the salt bridge, anions migrate _____fromto the Cd|Cd2+ compartment _____fromto the Zn|Zn2+ compartment.

Enter electrons as e-. Use smallest possible integer coefficients for ALL reactions. If a box is not needed, leave it blank.

Explanation / Answer

Zn(s) ----> Zn+2(aq) + 2e- anode

Cd+2(aq) +2e- ------> Cd(s) cathode

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Zn(s) + Cd+2(aq) -----> Cd(s) + Zn+2(aq) net cell reaction

In the external circuit, electrons migrate from the Zn/Zn+2 electrode to the Cd/Cd+2 electrode.

In the salt bridge anions migrate from the Cd/Cd+2 compartment to the Zn/Zn+2 compartment

I think the second sentence is not clear, in the salt bridge the anions move from the salt bridge to the Zn/Zn+2 compartment, but they move from the bridge, not from the Cd/Cd+2 compartment. I put "from" in my answer because that was the option but i don´t think it is really correct. I hope you understand, let me know if not :)

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