Electrochemical Cells: Components and Reactions

Question

A voltaic cell is constructed in which the following cell reaction occurs. The half-cell compartments are connected by a salt bridge.

Cl₂(g) + Hg(l)  2Cl^-(aq) + Hg²⁺(aq)

The anode reaction is:

+

+

The cathode reaction is:

+

+

In the external circuit, electrons migrate _____from or to the Cl^-|Cl₂ electrode _____from or to the Hg|Hg²⁺ electrode.

In the salt bridge, anions migrate _____fromto the Cl^-|Cl₂ compartment _____from or to the Hg|Hg²⁺ compartment.

Answer 1

The anode reaction is Hg(l) ==> Hg²⁺(aq) + 2e-

The cathode reaction is Cl2(g) + 2e- ==> 2Cl-(aq)

Electrons migrate to the Cl-/Cl2 electrode from the Hg/Hg2+ electrode

In the salt bridge, anions migrate to the Hg/Hg2+ compartment