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.

Answer 1

Answer:

Molten LiF forms solid lithium

Aqueous AgF forms solid silver

Aqueous LiF forms hydrogen gas.

Explanation:

Aqueous solution of $LiF$ has water molecule, there will be competing will be two competing cations for reduction, while $Li^{+}(aq)$ and$H^{+}(aq)$.However the reduction potential of $H^{+}(aq)$ is  more than that of the $Li^{+}(aq)$ . Hence, $H^{+}(aq)$ reduced to hydrogen gas.

Molten$LiF$  has only solid form of $LiF$ and $Li^{+}(aq)$ reduced to form $Li$ solid.

An aqueous form of $AgF$ contains water molecules.there will be competing will be two competing cations for reduction, while $Ag^{3+}(aq)$ and$H^{+}(aq)$.However the reduction potential of $Ag^{3+}(aq)$ is  more than that of the $H^{+}(aq)$ . Hence, $Ag^{3+}(aq)$ reduced to solid silver.

Therefore, Molten LiF forms solid lithium

Aqueous AgF forms solid silver

Aqueous LiF forms hydrogen gas.