?A voltaic cell similar to that shown in Figure 20.5 is constructed. One half-cell

Chapter 20, Problem 20.3

(choose chapter or problem)

A voltaic cell similar to that shown in Figure 20.5 is constructed. One half-cell consists of an aluminum strip placed in a solution of \(\mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3}\), and the other has a nickel strip placed in a solution of \(\mathrm{NiSO}_{4}\). The overall cell reaction is

\(2 \mathrm{Al}(s)+3 \mathrm{Ni}^{2+}(a q) \longrightarrow 2 \mathrm{Al}^{3+}(a q)+3 \mathrm{Ni}(s)\)

(a) What is being oxidized, and what is being reduced?

(b) Write the half-reactions that occur in the two half-cells

(c) Which electrode is the anode, and which is the cathode?

(d) Indicate the signs of the electrodes.

(e) Do electrons flow from the aluminum electrode to the nickel electrode or from the nickel to the aluminum?

(f) In which directions do the cations and anions migrate through the solution? Assume the Al is not coated with its oxide.

Text Transcription:

Al(NO3)3

NiSO_4

2 Al(s) + 3 Ni 2+(aq) \longrightarrow 2 Al 3+(aq) + 3 Ni(s)