Voltage Generated

Question

The voltage generated by the zinc concentration cell described by the line notation

Zn(s) ∣∣ Zn2+(aq,0.100 M) ‖‖ Zn2+(aq,? M) ∣∣ Zn(s)Zn(s) | Zn2+⁢(aq,0.100 M) ‖ Zn2+⁢(aq,? M) | Zn(s)

is 21.0 mV21.0 mV at 25 °C.25 °C. Calculate the concentration of the Zn2+(aq)Zn2+⁢(aq) ion at the cathode.

Answer 1

I'm pretty certain you need to use the Nernst equation, but since I am having great difficulty understanding your line notation, I am unable to help. It seems like you are notating Zn as both the anode and the cathode, and you have Zn(s) represented 4 times? Also, what is 21.0 mV? I just can't follow your description of the cell.

Also, a single line separates the pole from the solution and a double line represents the salt bridge, such as

Zn(s) | Zn²⁺(aq.0.200M) || Zn²⁺(aq. ? M) | Zn(s)