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Chapter 17: Problem 110

What reaction will take place at the cathode and the anode when each of the following is electrolyzed? a. molten KF b. molten \(\mathrm{CuCl}_{2}\) c. molten \(\mathrm{MgI}_{2}\)

Short Answer

Expert verified
a. In molten KF, potassium (K) metal is produced at the cathode, and fluorine (F鈧�) gas is produced at the anode. b. During the electrolysis of molten CuCl鈧�, copper (Cu) metal is produced at the cathode, and chlorine (Cl鈧�) gas is produced at the anode. c. During the electrolysis of molten MgI鈧�, magnesium (Mg) metal is produced at the cathode, and iodine (I鈧�) gas is produced at the anode.

Step by step solution

01

a. Molten KF

In molten KF, there are potassium (K鈦�) and fluoride (F鈦�) ions. At the cathode (reduction): K鈦� + e鈦� -> K At the anode (oxidation): 2F鈦� -> F鈧� + 2e鈦� Therefore, during the electrolysis of molten KF, potassium metal is produced at the cathode, and fluorine gas is produced at the anode.
02

b. Molten CuCl鈧�

In molten CuCl鈧�, there are copper (Cu虏鈦�) and chloride (Cl鈦�) ions. At the cathode (reduction): Cu虏鈦� + 2e鈦� -> Cu At the anode (oxidation): 2Cl鈦� -> Cl鈧� + 2e鈦� During the electrolysis of molten CuCl鈧�, copper metal is produced at the cathode, and chlorine gas is produced at the anode.
03

c. Molten MgI鈧�

In molten MgI鈧�, there are magnesium (Mg虏鈦�) and iodide (I鈦�) ions. At the cathode (reduction): Mg虏鈦� + 2e鈦� -> Mg At the anode (oxidation): 2I鈦� -> I鈧� + 2e鈦� During the electrolysis of molten MgI鈧�, magnesium metal is produced at the cathode, and iodine gas is produced at the anode.

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