농도차 전지. 0.0100 M and 1.55 M Cl^- ion

농도차 전지. 0.0100 M and 1.55 M Cl^- ion

 

 

A voltaic cell is constructed with two silver-silver chloride electrodes,

where the half-reaction is

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

 

The concentrations of chloride ion in the two compartments

are 0.0156 M and 1.55 M, respectively.

At 25°C, the cell emf is _____ V.

 

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▶ 참고: 농도차 전지 [ https://ywpop.tistory.com/9626 ]

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▶ 농도차 전지의 기전력을 계산할 때는

E° = 0 V, 이것 하나만 기억하면 된다.

 

 

 

AgCl(s) + e^- → Ag(s) + Cl^-(aq)

---> n = 1

 

 

 

Nernst, 네른스트 식

E = E° - (0.0592 V / n) log(묽은 농도 / 진한 농도)

= (0) - (0.0592 / 1) log(0.0100 / 1.55)

= +0.1297 V

 

 

 

답: +0.130 V

 

 

 

 

(a) Which electrode is the cathode of the cell?

[Cl^-] = 1.55 M

 

 

 

 

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