Suppose a current is applied to a molten mixture of PbF2, FeCl2, and Mgl2 and yo

Question

Suppose a current is applied to a molten mixture of PbF2, FeCl2, and Mgl2 and you want to identify the products in the electrolysis of the mixture. After comparing reduction and oxidation potentials, you have determined that Pb2 wll be reduced at the cathode and I will be oxidized at the anode. Now, write out the half-reaction for the reduction and oxidation to identify the product at each electrode. Complete the half-reaction for the reduction of Pb2 to determine the product at the cathode. 2+ Complete the half-reaction for the oxidation of I to determine the product at the anode. 212e+

Explanation / Answer

The cathode is an electrode used in reactions like these where the terminal is negative. And the anode is the opposite electrode in which the terminal is positive.

Opposite charges attract, so the ion (charged atom) that is oppositely charged to the electrode will be attracted by it.
Pb2+ ion will accept 2 electrons from the cathode (the negative terminal) and get reduced to give Pb.

Pb2+ +2e- ----------? Pb

Similarly at the anode (the positive terminal) the iodide ions will give up their electrons to become iodine gas and hence are said to be oxidised.

2I- ----------?2e-+ I2

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