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Pertanyaan

Dengan bantuan tabel potensial reduksi standar, tentukan reaksi redoks berikut! A. Zn ( s ) / Zn 2 + ( a q ) // Cr 3 + ( a q ) / Cr ( s ) B. Mg ( s ) / Mg 2 + ( a q ) // Ag + ( a q ) / Ag ( s ) C. Cd ( s ) / Cd 2 + ( a q ) // Pb 2 + ( a q ) / Pb ( s )

Dengan bantuan tabel potensial reduksi standar, tentukan italic E italic degree subscript sel reaksi redoks berikut!

A. 

B.  

C.  space 

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A. Chandra

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Jawaban

jawaban yang benar nilai pada reaksi A adalah 0,02 V; Badalah 3,16 V; dan Cadalah 0,27 V.

jawaban yang benar nilai italic E italic degree subscript sel pada reaksi A adalah 0,02 V; B adalah 3,16 V; dan C adalah 0,27 V.space 

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Pembahasan

dihitung berdasar selisih potensial reduksi zat tereduksi dengan potensial oksidasi zat teroksidasi. Berdasarkan potensial standar pada: Maka potensial sel berikut: A. B. C. Jadi, jawaban yang benar nilai pada reaksi A adalah 0,02 V; Badalah 3,16 V; dan Cadalah 0,27 V.

italic E italic degree subscript sel dihitung berdasar selisih potensial reduksi zat tereduksi dengan potensial oksidasi zat teroksidasi. Berdasarkan italic E italic degree subscript sel potensial standar pada:

Zn to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields Zn open parentheses italic s close parentheses space space space italic E italic degree equals minus sign 0 comma 76 space V Cr to the power of 3 plus sign left parenthesis italic a italic q right parenthesis plus 3 e to the power of minus sign yields Cr open parentheses italic s close parentheses space space space space italic E italic degree equals minus sign 0 comma 74 space V Mg to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields Mg open parentheses italic s close parentheses space space italic E italic degree equals minus sign 2 comma 36 space V Ag to the power of plus sign left parenthesis italic a italic q right parenthesis plus e to the power of minus sign yields Ag open parentheses italic s close parentheses space space space space space space space italic E italic degree equals plus 0 comma 80 space V Cd to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields Cd open parentheses italic s close parentheses space space space italic E italic degree equals minus sign 0 comma 40 space V Pb to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields Pb open parentheses italic s close parentheses space space space italic E italic degree equals minus sign 0 comma 13 space V 

Maka potensial sel berikut:

A. Zn open parentheses italic s close parentheses forward slash Zn to the power of 2 plus sign left parenthesis italic a italic q right parenthesis forward slash forward slash Cr to the power of 3 plus sign left parenthesis italic a italic q right parenthesis forward slash Cr open parentheses italic s close parentheses


table attributes columnalign right center left columnspacing 0px end attributes row cell italic E italic degree sel end cell equals cell italic E degree subscript Cr to the power of 3 plus sign forward slash Cr end subscript minus sign italic E degree subscript Zn to the power of 2 plus sign forward slash Zn end subscript end cell row blank equals cell negative sign 0 comma 74 minus sign left parenthesis minus sign 0 comma 76 right parenthesis space V end cell row blank equals cell plus 0 comma 02 space V end cell end table 


B. Mg open parentheses italic s close parentheses forward slash Mg to the power of 2 plus sign left parenthesis italic a italic q right parenthesis forward slash forward slash Ag to the power of plus sign left parenthesis italic a italic q right parenthesis forward slash Ag open parentheses italic s close parentheses 


table attributes columnalign right center left columnspacing 0px end attributes row cell italic E italic degree sel end cell equals cell italic E degree subscript Ag to the power of plus sign forward slash Ag end subscript minus sign italic E degree subscript Mg to the power of 2 plus sign forward slash Mg end subscript end cell row blank equals cell 0 comma 80 minus sign left parenthesis minus sign 2 comma 36 right parenthesis space V end cell row blank equals cell plus 3 comma 16 space V end cell end table


C. Cd open parentheses italic s close parentheses forward slash Cd to the power of 2 plus sign left parenthesis italic a italic q right parenthesis forward slash forward slash Pb to the power of 2 plus sign left parenthesis italic a italic q right parenthesis forward slash Pb open parentheses italic s close parentheses 


table attributes columnalign right center left columnspacing 0px end attributes row cell italic E italic degree sel end cell equals cell italic E degree subscript Pb to the power of 2 plus sign forward slash Pb end subscript minus sign italic E degree subscript Cd to the power of 2 plus sign forward slash Cd end subscript end cell row blank equals cell negative sign 0 comma 13 minus sign left parenthesis minus sign 0 comma 40 right parenthesis space V end cell row blank equals cell plus 0 comma 27 space V end cell end table


Jadi, jawaban yang benar nilai italic E italic degree subscript sel pada reaksi A adalah 0,02 V; B adalah 3,16 V; dan C adalah 0,27 V.space 

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