posted by Anonymous .
When a pair of copper wires are connected to the (+) and (–) terminals of a 9–V battery and immersed in a solution containing I- ions, one of the wires becomes coated with I2. Besides simply wiping off the wire, how else could you remove the I2 coating?
1. Dissolve the I2 in KI solution.
2. Dissolve the I2 in CCl4, chloroform, or some other non-polar organic solvent.
3. Dissolve the I2 is Na2S2O3.
4. Reverse the polarity of the wires by switching the leads at the battery.