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Hitunglah standar Emf dari sel yang mengikuti pers...

Hitunglah standar Emf dari sel yang mengikuti persamaan reaksi berikut.


begin mathsize 14px style Cr subscript 2 O subscript 7 to the power of 2 minus sign end exponent left parenthesis italic a italic q right parenthesis plus 14 H to the power of plus sign left parenthesis italic a italic q right parenthesis plus 6 I to the power of minus sign left parenthesis italic a italic q right parenthesis yields 2 Cr to the power of 3 plus sign left parenthesis italic a italic q right parenthesis plus 3 I subscript 2 open parentheses italic s close parentheses and 7 H subscript 2 O open parentheses italic l close parentheses end style 

Jawaban:

Metode setengah reaksi


begin mathsize 14px style Cr subscript 2 O subscript 7 to the power of 2 minus sign end exponent plus 14 H to the power of plus sign and 6 e yields 2 Cr to the power of 3 plus sign and 7 H subscript 2 O space space space E to the power of 0 equals plus 1 comma 33 space V I subscript 2 and 2 e yields 2 I to the power of minus sign space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space E to the power of 0 equals plus 0 comma 54 space V end style 


Kemudian hitung Potensial Reaksi


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell E to the power of 0 space sel end cell equals cell E subscript reduksi bond E subscript oksidasi end cell row blank equals cell E to the power of 0 Cr subscript 2 O subscript 7 to the power of 2 minus sign end exponent minus sign E to the power of 0 I subscript 2 end cell row blank equals cell plus 1 comma 33 V minus sign left parenthesis plus 0 comma 54 V right parenthesis end cell row blank equals cell plus 0 comma 79 V end cell end table end style 


Jadi, nilai standar Emf reaksi tersebut adalah +0,79 V.

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