I2(s) + 2e^- → 2I^-(aq) E° = 0.5355 V

I2(s) + 2e^- → 2I^-(aq) E° = 0.5355 V

 

 

Following are two reduction half-reactions

for the half-cells of a voltaic cell.

Determine the overall cell reaction

and the standard potential.

Write the cell chemistry using cell notation

with vertical lines separating components.

I2(s) + 2e^- → 2I^-(aq) ... E° = 0.5355 V

Fe^2+(aq) + 2e^- → Fe(s) ... E° = –0.447 V

 

---------------------------------------------------

 

.. Fe(s) → Fe^2+(aq) + 2e^- ... 산화 반쪽

+) I2(s) + 2e^- → 2I^-(aq) ... 환원 반쪽

----------------------------------

.. Fe(s) + I2(s) → Fe^2+(aq) + 2I^-(aq)

---> overall cell reaction

 

 

 

E°_cell = E°_red(환원전극) – E°_red(산화전극)

= (환원된 물질의 표준환원전위) – (산화된 물질의 표준환원전위)

( 참고 https://ywpop.tistory.com/4558 )

 

= (+0.5355 V) – (–0.447 V)

= +0.983 V

 

 

 

cell notation

( 참고 https://ywpop.tistory.com/3072 )

 

Fe(s) | Fe^2+(aq) || I^-(aq) | I2(s)