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A voltaic cell is constructed in which the following cell reaction occurs. The half-cell compartments are connected by a salt bridge. 3Sn2+(aq)+2AI(s)3Sn(s)+2AI3+(aq) The anode reaction is: ++ The cathode reaction is: + In the external circuit, electrons migrate the AIA3+ electrode the SnSn2+ electrode. In the salt bridge, anions migrate the AA3+ compartment the SnSn2+ compartment