?Assume that you want to construct a voltaic cell that uses the following

Chapter 20, Problem 20.4

(choose chapter or problem)

Assume that you want to construct a voltaic cell that uses the following half-reactions:

\(\mathrm{A}^{2+}(a q)+2 \mathrm{e}^{-} \longrightarrow \mathrm{A}(s) \quad E_{\text {red }}^{\circ}=-0.10 \mathrm{~V}\)

\(\mathrm{B}^{2+}(a q)+2 \mathrm{e}^{-} \longrightarrow \mathrm{B}(s) \quad E_{\mathrm{red}}^{\circ}=-1.10 \mathrm{~V}\)

You begin with the incomplete cell pictured here in which the electrodes are immersed in water.

(a) What additions must you make to the cell for it to generate a standard emf?

(b) Which electrode functions as the cathode?

(c) Which direction do electrons move through the external circuit?

(d) What voltage will the cell generate under standard conditions? [Sections 20.3 and 20.4]

Text Transcription:

{A}^{2+}(a q)+2 {e}^{-} \longrightarrow {A}(s) \quad E_red }}^{\circ}=-0.10 V

{B}^{2+}(a q)+2 {e}^{-} \longrightarrow {B}(s) \quad E_{red}}^{\circ}=-1.10 V