Consider four different samples aqueous LiF, molten LiF, aqueous AgF, and molten

Question

Consider four different samples aqueous LiF, molten LiF, aqueous AgF, and molten AgF. Current run through each sample produces one of the following products at the cathode: solid lithium, solid silver, or hydrogen gas. Match each sample to its cathodic product. Drag the appropriate items to their respective bins. Part B Consider four different samples aqueous KBr, molten KBr, aqueous KF, and molten KF. Current run through each sample produces one of the following products at the anode: liquid bromine, fluorine gas, or oxygen gas. Match each sample to its anodic product. Drag the appropriate items to their respective bins.

Explanation / Answer

(A)

Solid Lithium: molten LiF

Li+ + e ----------> Li (s)

Solid Ag: Both molten AgF and aqueous AgF

Though H+ ions are also present in aqueous AgF, the reduction potential of Ag+ is greater than H+. Hence Ag+ gets reduced at cathode.

Ag+ + e ------------> Ag (s)

H2 gas: Aqueous LiF

In aqueous LiF, both Li+ and H+ cations are present. Since the reduction potential of H+ is greater than Li+, H+ undergoes reduction at cathode.

2 H+ (aq.) + 2e -----------> H2 (g)

(B)

Molter KBr : Br2 (l) is produced at anode

Molten KF: F2 (g) is produced at anode

Aqueous KBr: O2 gas is produced at anode. Because reduction potential of OH- is less than Br-

Aqueous KF: O2 gas is produced at anode. Because reduction potential of OH- is less than Br-

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