Suppose a powerful battery is connected between a pair of inert graphite electro

Question

Suppose a powerful battery is connected between a pair of inert graphite electrodes dipped into a pot of moltern magnesium iodide (Mg2) (see sketch at right). The battery makes a current of electrons flow in the directions shown by the arrows in the sketch. Note: Group 1A and Group 2A metals all melt at temperatures lower than their salts. 2. Which electrode is the anode? Write a balanced equation for the half-reaction that takes place at electrode A. Write a balanced equation for n the overall reaction

Explanation / Answer

1) The electrode which is anode (positive electrode) is A (chloride).

2) Balanced equation for the half reaction at electrode A (anode)

2Cl--2e- -------> Cl2 (oxidation - loss of electrons)

3) Balanced equation for the overall reaction:

MgCl2(l) -------> Mg(s) + Cl2(g)

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