객관식
Which of the following compounds will conduct electricity when dissolved in water?
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6. Chemical Quantities & Aqueous Reactions
Electrolytes
객관식
During the electrolysis of aqueous AgF, what is produced at the cathode and at the anode?
A
Hydrogen gas is produced at the cathode; oxygen gas is produced at the anode.
B
Silver metal is deposited at the anode; hydrogen gas is produced at the cathode.
C
Fluorine gas is produced at the anode; silver metal is deposited at the cathode.
D
Silver metal is deposited at the cathode; oxygen gas is produced at the anode.
검증된 단계별 안내1
Identify the species present in the aqueous solution of AgF: Ag\(\textsuperscript{+}\), F\(\textsuperscript{-}\), H\(\textsubscript{2}\)O molecules, and possibly H\(\textsuperscript{+}\) and OH\(\textsuperscript{-}\) from water dissociation.
At the cathode (reduction site), determine which species will be reduced. Compare the reduction potentials of Ag\(\textsuperscript{+}\) and H\(\textsuperscript{+}\) (from water). Since silver ion has a higher reduction potential, Ag\(\textsuperscript{+}\) will be reduced to silver metal (Ag).
Write the cathode half-reaction: $\$\$\(\mathrm{Ag^{+}\) + e^{-} \(\rightarrow\) Ag (s)}\$\$\$
At the anode (oxidation site), determine which species will be oxidized. Fluoride ions (F\(\textsuperscript{-}\)) are generally not oxidized easily compared to water. Water is oxidized to oxygen gas (O\(\textsubscript{2}\)) and protons.
Write the anode half-reaction: $\$\$\(\mathrm{2 H_{2}\)O (l) \(\rightarrow\) O_{2} (g) + 4 H^{+} + 4 e^{-}}\$\$\$
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