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Dengan memperhatikan potensial reduksi standar, tentukan apakah reaksi berikut berlangsung spontan atau tidak. a. Cl 2 ​ ( a q ) + 2 F − ( a q ) → F 2 ​ ( a q ) + 2 Cl − ( a q ) b. I 2 ​ ( a q ) + 2 Fe 2 + ( a q ) → 2 I − ( a q ) + Fe 3 + ( a q ) c. Br − ( a q ) + Fe 3 + ( a q ) → 2 1 ​ Br 2 ​ ( a q ) + Fe 2 + ( a q )

Dengan memperhatikan potensial reduksi standar, tentukan apakah reaksi berikut berlangsung spontan atau tidak.

a.    

b.     

c.    space space space

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N. Puspita

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dari ketiga reaksi diatas, semuanya tidak berlangsung spontan karena nilai potensial reduksinya negatif.

dari ketiga reaksi diatas, semuanya tidak berlangsung spontan karena nilai potensial reduksinya negatif.space space space

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Berikut data potensial reduksi standar untuk reaksi di atas: Reaksi dikatakan spontan jika nilai potensial sel reaksinya positif. Potensial sel reaksi dapat dihitung menggunakan persamaan: a. b. c. Jadi, dari ketiga reaksi diatas, semuanya tidak berlangsung spontan karena nilai potensial reduksinya negatif.

Berikut data potensial reduksi standar untuk reaksi di atas:

F subscript 2 left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields 2 F to the power of space minus sign end exponent left parenthesis italic a italic q right parenthesis space space space space space space space space space italic E degree equals plus 2 comma 87 space V Cl subscript 2 left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields 2 Cl to the power of minus sign left parenthesis italic a italic q right parenthesis space space space space space space space space italic E degree equals plus 1 comma 36 space V Br subscript 2 left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields 2 Br to the power of minus sign left parenthesis italic a italic q right parenthesis space space space space space space space italic E degree equals plus 1 comma 09 space V I subscript 2 left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields 2 I to the power of minus sign left parenthesis italic a italic q right parenthesis space space space space space space space space space space space space italic E degree equals plus 0 comma 54 space V Fe to the power of 3 plus sign left parenthesis italic a italic q right parenthesis plus e to the power of minus sign yields Fe to the power of 2 plus sign left parenthesis italic a italic q right parenthesis space space space space space space italic E degree equals plus 0 comma 77 space V space space space space space space space space space 

Reaksi dikatakan spontan jika nilai potensial sel reaksinya positif. Potensial sel reaksi dapat dihitung menggunakan persamaan:

italic E degree subscript sel equals italic E degree subscript reduksi minus sign italic E degree subscript oksidasi italic E degree subscript sel equals italic E degree subscript katode minus sign italic E degree subscript anode 

 

a.   Cl subscript 2 left parenthesis italic a italic q right parenthesis plus 2 F to the power of minus sign left parenthesis italic a italic q right parenthesis yields F subscript 2 left parenthesis italic a italic q right parenthesis plus 2 Cl to the power of minus sign left parenthesis italic a italic q right parenthesis

      italic E degree subscript sel equals italic E degree subscript reduksi minus sign italic E degree subscript oksidasi italic E degree subscript sel equals italic E degree subscript Cl subscript 2 vertical line Cl to the power of minus sign end subscript minus sign italic E degree subscript F subscript 2 vertical line F to the power of minus sign end subscript italic E degree subscript sel equals left parenthesis plus 1 comma 36 space V right parenthesis minus sign left parenthesis plus 2 comma 87 space V right parenthesis italic E degree subscript sel equals minus sign 1 comma 51 space V  

 

b.   I subscript 2 left parenthesis italic a italic q right parenthesis plus 2 Fe to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields 2 I to the power of minus sign left parenthesis italic a italic q right parenthesis plus Fe to the power of 3 plus sign left parenthesis italic a italic q right parenthesis  

      italic E degree subscript sel equals italic E degree subscript reduksi minus sign italic E degree subscript oksidasi italic E degree subscript sel equals italic E degree subscript I subscript 2 vertical line I to the power of minus sign end subscript minus sign italic E degree subscript Fe to the power of 3 plus sign vertical line Fe to the power of 2 plus sign end subscript italic E degree subscript sel equals left parenthesis plus 0 comma 54 space V right parenthesis minus sign left parenthesis plus 0 comma 77 space V right parenthesis italic E degree subscript sel equals minus sign 0 comma 23 space V  

 

c.   Br to the power of minus sign left parenthesis italic a italic q right parenthesis plus Fe to the power of 3 plus sign left parenthesis italic a italic q right parenthesis rightwards arrow begin inline style 1 half end style Br subscript 2 left parenthesis italic a italic q right parenthesis plus Fe to the power of 2 plus sign left parenthesis italic a italic q right parenthesis 

      italic E degree subscript sel equals italic E degree subscript reduksi minus sign italic E degree subscript oksidasi italic E degree subscript sel equals italic E degree subscript Fe to the power of 3 plus sign vertical line Fe to the power of 2 plus sign end subscript minus sign italic E degree subscript Br subscript 2 vertical line Br to the power of minus sign end subscript italic E degree subscript sel equals left parenthesis plus 0 comma 77 space V right parenthesis minus sign left parenthesis plus 1 comma 09 space V right parenthesis italic E degree subscript sel equals minus sign 0 comma 32 space V 


Jadi, dari ketiga reaksi diatas, semuanya tidak berlangsung spontan karena nilai potensial reduksinya negatif.space space space

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