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Diketahui data potensial reduksi sebagai berikut: E°Ca 2+ /Ca=-2,87V E°Mg 2+ /Mg=-2,37V ​ E°Pb 2+ /Pb=-0,13V E°Au 2+ /Au=+1,50V ​ Diagram sel berikut yang berlangsung spontan adalah ....

Diketahui data potensial reduksi sebagai berikut:

Diagram sel berikut yang berlangsung spontan adalah ....

  1. begin mathsize 14px style text Mg/Mg end text to the power of text 2+ end text end exponent text //Ca end text to the power of text 2+ end text end exponent text /Ca end text end style

  2. begin mathsize 14px style text Pb/Pb end text to the power of text 2+ end text end exponent text //Mg end text to the power of text 2+ end text end exponent text /Mg end text end style

  3. begin mathsize 14px style text Au/Au end text to the power of text 3+ end text end exponent text //Pb end text to the power of text 2+ end text end exponent text /Pb end text end style

  4. begin mathsize 14px style text Ca/Ca end text to the power of text 2+ end text end exponent text //Mg end text to the power of text 2+ end text end exponent text /Mg end text end style

  5. begin mathsize 14px style text Au/Au end text to the power of text 3+ end text end exponent text //Ca end text to the power of text 2+ end text end exponent text /Ca end text 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. Pada notasi sel berlaku : oksidasi || reduksi Maka, reaksi yang berlangsung spontan adalah Ca| Ca 2 + || Mg 2+ | Mg

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

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 Mg divided by Mg to the power of 2 plus end exponent space ⫽ space Ca to the power of 2 plus end exponent divided by Ca end style

E to the power of o space space equals space E to the power of o Ca space minus sign space E to the power of o Mg space equals minus sign 2 comma 87 space minus sign space left parenthesis minus sign 2 comma 37 right parenthesis space equals space minus sign 0 comma 5 space V

  • begin mathsize 14px style Pb divided by Pb to the power of 2 plus end exponent space ⫽ space Mg to the power of 2 plus end exponent divided by Mg end style

E to the power of o space space equals space E to the power of o Mg space minus sign space E to the power of o Pb space equals minus sign 2 comma 37 space minus sign space left parenthesis minus sign 0 comma 13 right parenthesis space equals space minus sign 2 comma 24 space v

  • begin mathsize 14px style Au divided by Au to the power of 3 plus end exponent space ⫽ space Pb to the power of 2 plus end exponent divided by Pb end style

E to the power of o space space equals space E to the power of o Pb space minus sign space E to the power of o Au space equals minus sign 0 comma 13 space minus sign space left parenthesis plus 1 comma 50 right parenthesis space equals space minus sign 1 comma 63 space V space

  • begin mathsize 14px style Ca divided by Ca to the power of 2 plus end exponent space ⫽ space Mg to the power of 2 plus end exponent divided by Mg end style

E to the power of o space space equals space E to the power of o Mg space minus sign space E to the power of o Ca space equals minus sign 2 comma 37 space minus sign space left parenthesis minus sign 2 comma 87 right parenthesis space equals space plus 0 comma 5 space V

  • begin mathsize 14px style Au divided by Au to the power of 3 plus end exponent space ⫽ space Ca to the power of 2 plus end exponent divided by Ca end style

E to the power of o space equals space E to the power of o Ca space minus sign space E to the power of o Au space equals left parenthesis minus sign 2 comma 87 right parenthesis space minus sign space left parenthesis 1 comma 50 right parenthesis space equals space minus sign 4 comma 37 space V

Maka, reaksi yang berlangsung spontan adalah Ca | Ca2|| Mg2+ | Mg

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