A voltaic cell is constructed in which the anode is a Fe2+|Fe3+ half cell and the cathode is a Br-|Br2 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 (from/to) the Fe2+|Fe3+ electrode (from/to) the Br-|Br2 electrode.

In the salt bridge, anions migrate (from/to) the Br-|Br2 compartment (from/to) the Fe2+|Fe3+ compartment.

#2
A voltaic cell is constructed in which the following cell reaction occurs. The half-cell compartments are connected by a salt bridge.

I2(s) + Pb(s) --->2I-(aq) + Pb2+(aq)

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)

In the external circuit, electrons migrate (from/to) the Pb|Pb2+ electrode (from/to) the I-|I2 electrode.

In the salt bridge, anions migrate (from/to) the Pb|Pb2+ compartment (from/to) the I-|I2 compartment.