Enter electrons as e¯. Use smallest possible integer coefficients for ALL reactions. If a box is not needed, leave it blank. A voltaic cell is constructed in which the following cell reaction occurs. The half-cell compartments are connected by a salt bridge. Fe³ (aq) + Cr²+(aq) → Fe²+(aq) + Cr³(aq) The anode reaction is: + + The cathode reaction is: In the external circuit, electrons migrate the Cr²+|Cr³+ electrode the Fe2+ Fe3+ electrode. In the salt bridge, anions migrate the Cr²+ Cr3+ compartment the Fe2+ Fe3+ compartment.