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Diketahui potensial reduksi standar sebagai berikut: Fe2+/Fe     E° = -0,41 V Zn2+/Zn     E° = -0,76 V Cu2+/Cu    E° = +0,34 V Ag+/Ag      E° = +0,80 V Reaksi yang tidak dapat berlangsung spontan adalah ....

Pertanyaan

Diketahui potensial reduksi standar sebagai berikut:

Fe2+/Fe     E° = -0,41 V
Zn2+/Zn     E° = -0,76 V
Cu2+/Cu    E° = +0,34 V
Ag+/Ag      E° = +0,80 V

Reaksi yang tidak dapat berlangsung spontan adalah ....

  1. Fe/ Fe2+/ / Zn2+/Zn

  2. Zn/ Zn2+/ / Cu2+/Cu

  3. Fe/ Fe2+/ / Cu2+/Cu

  4. Cu/ Cu2+/ / Ag+/Ag

  5. Fe/ Fe2+/ / Ag+/Ag

N. Puji

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

Jawaban terverifikasi

Pembahasan

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

2rb+

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Pertanyaan serupa

Berikut adalah data potensial reduksi standar (E∘) untuk beberapa kation.  Co2++2e−→Co   E∘=−0,28 VCr3++3e−→Cr    E∘=−0,74VAu3++3e−→Au   E∘=+1,42 VPb2++2e−→Pb   E∘=−0,13 V  Sel volta yang bereaksi...

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