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Diketahui potensial reduksi standar sebagai berikut: Fe 2 + / Fe E ∘ = ‐0 , 41 V Zn 2 + / Zn E ∘ = ‐0 , 76 V Cu 2 + / Cu E ∘ = + 0 , 34 V Ag + / Ag E ∘ = + 0 , 80 V Reaksi yang tidak dapat berlangsung spontan adalah ....

Diketahui potensial reduksi standar sebagai berikut:

Reaksi yang tidak dapat berlangsung spontan adalah ....

  1. begin mathsize 14px style Fe divided by Fe to the power of 2 plus end exponent ⫽ Zn to the power of 2 plus end exponent divided by Zn end style

  2. begin mathsize 14px style Zn divided by Zn to the power of 2 plus end exponent ⫽ Cu to the power of 2 plus end exponent divided by Cu end style

  3. begin mathsize 14px style Fe divided by Fe to the power of 2 plus end exponent ⫽ Cu to the power of 2 plus end exponent divided by Cu end style

  4. begin mathsize 14px style Cu divided by Cu to the power of 2 plus end exponent ⫽ Ag to the power of plus divided by Ag end style

  5. begin mathsize 14px style Fe divided by Fe to the power of 2 plus end exponent ⫽ Ag to the power of plus divided by Ag end style

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A. Tiara

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

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Pembahasan

Reaksi yang dapat berlangsung spontan adalah reaksi yang memiliki nilai E°selpositif. Maka, reaksi yang tidak spontan memiliki E°sel negatif. Pada notasi sel berlaku : oksidasi || reduksi Maka, reaksi yang tidak berlangsung spontan adalahFe| Fe 2 + || Zn 2+ | Zn

Reaksi yang dapat berlangsung spontan adalah reaksi yang memiliki nilai E°sel positif.

Maka, reaksi yang tidak spontan memiliki  E°sel negatif.

E degree equals space E degree R e d u k s i minus space E degree space o k s i d a s i 

Pada notasi sel berlaku : oksidasi || reduksi

  • begin mathsize 14px style Fe divided by Fe to the power of 2 plus end exponent ⫽ Zn to the power of 2 plus end exponent divided by Zn end style

E to the power of o space equals space E to the power of o Zn space minus sign space E to the power of o Fe space equals left parenthesis minus sign 0 comma 76 right parenthesis space minus sign space left parenthesis minus sign 0 comma 41 right parenthesis space equals minus sign 0 comma 33 space V

  • begin mathsize 14px style Zn divided by Zn to the power of 2 plus end exponent ⫽ Cu to the power of 2 plus end exponent divided by Cu end style

E to the power of o space equals space E to the power of o Cu space minus sign space E to the power of o Zn space equals left parenthesis plus 0 comma 34 right parenthesis space minus sign space left parenthesis minus sign 0 comma 76 right parenthesis space equals plus 1 comma 10 space V

  • begin mathsize 14px style Fe divided by Fe to the power of 2 plus end exponent ⫽ Cu to the power of 2 plus end exponent divided by Cu end style

E to the power of o space equals space E to the power of o Cu space minus sign space E to the power of o Fe space equals left parenthesis plus 0 comma 34 right parenthesis space minus sign space left parenthesis minus sign 0 comma 41 right parenthesis space equals plus 0 comma 75 space V

  • begin mathsize 14px style Cu divided by Cu to the power of 2 plus end exponent ⫽ Ag to the power of plus divided by Ag end style

E to the power of o space equals space E to the power of o Ag space minus sign space E to the power of o Cu space equals left parenthesis plus 0 comma 80 right parenthesis space minus sign space left parenthesis plus 0 comma 34 right parenthesis space equals plus 0 comma 46 space V

  • begin mathsize 14px style Fe divided by Fe to the power of 2 plus end exponent ⫽ Ag to the power of plus divided by Ag end style

E to the power of o space equals space E to the power of o Ag space minus sign space E to the power of o Fe space equals left parenthesis plus 0 comma 80 right parenthesis space minus sign space left parenthesis minus sign 0 comma 41 right parenthesis space equals plus 1 comma 21 space V

Maka, reaksi yang tidak berlangsung spontan adalah  Fe | Fe2|| Zn2+ | Zn

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Diketahui data berikut. Fe 3 + ( a q ) + e − → Fe 2 + E o = + 0 , 77 V Cu 2 + ( a q ) + 2 e − → Cu ( s ) E o = + 0 , 34 V Fe 2 + ( a q ) + 2 e − → Fe ( s ) E o = − 0 , 44 V Periksalah apakah...

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