[Zn^2+] = 0.1 M, [Cu^2+] = 0.2 M

[Zn^2+] = 0.1 M, [Cu^2+] = 0.2 M

 

 

Zn(s) | Zn^2+(0.1 M, aq) || Cu^2+(0.2 M, aq) | Cu(s)

의 전위차

 

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> Zn^2+(aq) + 2e^- → Zn(s)의 표준환원전위 = –0.76 V

> Cu^2+(aq) + 2e^- → Cu(s)의 표준환원전위 = +0.34 V

 

 

 

E°cell = E°red(환원전극) – E°red(산화전극)

= (+0.34 V) – (–0.76 V)

= +1.10 V

( 참고 https://ywpop.tistory.com/4558 )

 

 

 

전지 반응

Zn(s) + Cu^2+(aq) → Zn^2+(aq) + Cu(s)

 

 

 

Nernst 식

E = E° – (0.0592 V / n) × logQ

( 참고 https://ywpop.tistory.com/2900 )

 

= E° – (0.0592 V / n) × log([Zn^2+] / [Cu^2+])

= (+1.10) – (0.0592 / 2) × log(0.1 / 0.2)

= +1.11 V

 

 

 

 

[ 관련 예제 https://ywpop.tistory.com/18329 ] [Zn^2+] = 1.5 M, [Cu^2+] = 0.75 M

 

 

 

[키워드] Zn Cu cell 기준문서