A voltaic cell is constructed in which the anode is a Cr|Cr3+ half cell and the

Question

A voltaic cell is constructed in which the anode is a Cr|Cr3+ half cell and the cathode is a H2H 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 the Cr|Cr3+electrode the H2lH electrode In the salt bridge, anions migrate the Cr|Cr3+ compartment #jth H2IE compartmen

Explanation / Answer

Anode reaction:

Cr (s) -----------> Cr3+ (aq.) + 3 e

Cathode reaction :

2 H+ (aq.) + 2 e ------------> H2 (g)

The net cell reaction:

2 Cr (s) + 6 H+ (aq.) ---------> 2 Cr3+ (aq.) + 3 H2 (g)

In the external circuti, electrons migrate from the Cr/Cr3+ electrode to the H2/H+ electrode.

In the salt bride the anions migrate to the Cr/Cr3+ compartment fromt eh H2/H+ compartment.

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