기전력 계산. 2Au + 3Ca^2+ → 2Au^3+ + 3Ca

기전력 계산. 2Au + 3Ca^2+ → 2Au^3+ + 3Ca

 

 

Calculate the value of E°cell for the following reaction:

2Au(s) + 3Ca^2+(aq) → 2Au^3+(aq) + 3Ca(s)

Au^3+(aq) + 3e^- → Au(s) ... E° = +1.50 V

Ca^2+(aq) + 2e^- → Ca(s) ... E° = –2.87 V

 

A) –4.37 V

B) –1.37 V

C) –11.6 V

D) 1.37 V

E) 4.37 V

 

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E°cell = E°red(환원전극) – E°red(산화전극)

= (환원된 물질의 표준환원전위) – (산화된 물질의 표준환원전위)

( 참고 https://ywpop.tistory.com/4558 )

 

 

 

Ca가 환원되었으므로,

E°cell = E°red(환원전극) – E°red(산화전극)

= (–2.87) – (+1.50) = –4.37

 

 

 

답: A) –4.37 V

 

 

 

 

[키워드] emf 2Au(s) + 3Ca^2+(aq), emf 2Au + 3Ca^2+, emf Au + Ca^2+, emf 3Ca^2+(aq) + 2Au(s), emf 3Ca^2+ + 2Au, emf Ca^2+ + Au