Question

question 23 of 25
what is the standard cell notation for an electrolytic cell with aluminum and gold electrodes?
a. au+(aq) | au(s) || al(s) | al3+(aq)
b. al3+(aq) | al(s) || au(s) | au+(aq)
c. au(s) | au+(aq) || al3+(aq) | al(s)
d. al(s) | al3+(aq) || au+(aq) | au(s)

Explanation:

In standard cell notation for an electrochemical cell, the anode is written on the left - hand side and the cathode on the right - hand side. Oxidation occurs at the anode and reduction at the cathode. Aluminium is more reactive than gold and will be oxidized in this electrolytic cell. The general form of the cell notation is anode|anode ion (concentration)||cathode ion (concentration)|cathode. Aluminium metal ($Al(s)$) is oxidized to $Al^{3 + }(aq)$ at the anode and $Au^{+}(aq)$ is reduced to gold metal ($Au(s)$) at the cathode.

Answer:

D. $Al(s)\ |\ Al^{3 + }(aq)\ ||\ Au^{+}(aq)\ |\ Au(s)$