Co^2+/Co half cell AgCl/Ag half cell voltaic cell

A voltaic cell is based on a Co^2+/Co half-cell (E°_red = –0.28 V)

and an AgCl/Ag half-cell (E°_red = +0.22 V).

a) What half-reaction occurs at the anode?

b) What is the standard cell potential?

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a) What half-reaction occurs at the anode?

표준 환원 전위가 작은 쪽이 산화되므로,

Co(s) → Co^2+ + 2e^-

Co(s) → Co^2+(aq) + 2e^-

b) What is the standard cell potential?

E°_cell = E°_red(환원전극) – E°_red(산화전극)

= (환원된 물질의 표준환원전위) – (산화된 물질의 표준환원전위)

= (+0.22) – (–0.28)

= +0.50 V

[키워드] 볼타 전지 기준, Ag-Co 전지 기준, Ag-Co cell 기준

A voltaic cell is based on Co^2+/Co half-cell and a AgCl/Ag half-cell.

Given their standard reduction potentials,

which of the following is true about this electrochemical cell?

AgCl(s) + e^- → Ag(s) + Cl^- ... E° = +0.222 V

Co^2+ + 2e^- → Co(s) ... E° = –0.277 V