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Pertanyaan

Berikut merupakan data potensial reduksi dari beberapa jenis logam. Cu 2 + ( a q ) + 2 e − → Cu ( s ) E ∘ = + 0 , 34 V Fe 3 + ( a q ) + e − → Fe 2 + ( a q ) E ∘ = − 2 , 87 V Pb 2 + ( a q ) + 2 e − → Pb ( s ) E ∘ = − 0 , 33 V Cu 2 + ( a q ) + e − → Cu + ( a q ) E ∘ = + 0 , 16 V Berdasarkan data tersebut, reaksi berikut yang tidak dapat berlangsung adalah . . . .

Berikut merupakan data potensial reduksi dari beberapa jenis logam.

Berdasarkan data tersebut, reaksi berikut yang tidak dapat berlangsung adalah . . . .space

  1. Fe to the power of 3 plus sign open parentheses italic a italic q close parentheses plus Pb open parentheses italic s close parentheses yields Fe to the power of 2 plus sign open parentheses italic a italic q close parentheses plus Pb to the power of 2 plus sign open parentheses italic a italic q close parenthesesspace

  2. Cu to the power of 2 plus sign open parentheses italic a italic q close parentheses plus Pb open parentheses italic s close parentheses yields Cu open parentheses italic s close parentheses and Pb to the power of 2 plus sign open parentheses italic a italic q close parenthesesspace

  3. Pb to the power of 2 plus sign open parentheses italic a italic q close parentheses plus Cu open parentheses italic s close parentheses yields Pb open parentheses italic s close parentheses and Cu to the power of 2 plus sign open parentheses italic a italic q close parenthesesspace

  4. Fe to the power of 3 plus sign open parentheses italic a italic q close parentheses plus Cu open parentheses italic s close parentheses yields Fe to the power of 2 plus sign open parentheses italic a italic q close parentheses plus Cu to the power of 2 plus sign open parentheses italic a italic q close parenthesesspace

  5. Fe to the power of 3 plus sign open parentheses italic a italic q close parentheses plus Cu to the power of plus sign open parentheses italic s close parentheses yields Fe to the power of 2 plus sign open parentheses italic a italic q close parentheses plus Cu to the power of 2 plus sign open parentheses italic a italic q close parenthesesspace

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R. Harmiasri

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Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah optionA, C, D dan E.

jawaban yang tepat adalah option A, C, D dan E.space

Pembahasan

Reaksi tidak dapat berlangsung menandakan bahwa reaksi tersebut tidak spontan. Reaksi tidak spontan adalah reaksi yang tidak dapat mereduksi unsur-unsur disebelah kanannya dan potensial sel yang dihasilkannya bertanda negatif. Option A (reaksi tidak spontan) Option B (spontan) Option C (tidak spontan) Option D (tidak spontan) Option E (tidak spontan) Berdasarkan uraian di atas maka,reaksi berikut yang tidak dapat berlangsung adalah pada option A, C, D dan E. Jadi, jawaban yang tepat adalah optionA, C, D dan E.

Reaksi tidak dapat berlangsung menandakan bahwa reaksi tersebut tidak spontan. Reaksi tidak spontan adalah reaksi yang tidak dapat mereduksi unsur-unsur disebelah kanannya dan potensial sel yang dihasilkannya bertanda negatif.

  • Option A (reaksi tidak spontan)

table attributes columnalign right center left columnspacing 0px end attributes row cell Reduksi space open parentheses katode close parentheses end cell equals cell 2 Fe to the power of 3 plus sign plus up diagonal strike 2 e end strike to the power of minus sign yields 2 Fe to the power of 2 plus sign space space space space E degree equals minus sign 2 comma 87 end cell row cell Oksidasi space open parentheses anode close parentheses end cell equals cell Pb yields Pb to the power of 2 plus sign and up diagonal strike 2 e end strike space space space space space space space space space space space space space space E degree space equals minus sign 0 comma 33 end cell row cell Reaksi space sel end cell equals cell 2 Fe to the power of 3 plus sign and Pb yields 2 Fe to the power of 2 plus sign and Pb to the power of 2 plus sign end cell row cell E degree subscript sel end cell equals cell E degree subscript red minus sign E degree subscript oks end cell row blank equals cell negative sign 2 comma 87 minus sign left parenthesis minus sign 0 comma 33 right parenthesis end cell row blank equals cell negative sign 2 comma 87 plus 0 comma 33 end cell row blank equals cell negative sign 2 comma 54 space V end cell end table

  • Option B (spontan)

table attributes columnalign right center left columnspacing 0px end attributes row cell Reduksi space open parentheses katode close parentheses end cell equals cell Cu to the power of 2 plus sign and 2 e yields Cu space space space E degree equals plus 0 comma 34 end cell row cell Oksidasi space open parentheses anode close parentheses end cell equals cell Pb yields Pb to the power of 2 plus sign and 2 e space space space E degree equals minus sign 0 comma 33 end cell row cell Reaksi space sel end cell equals cell Cu to the power of 2 plus sign and Pb yields Cu and Pb to the power of 2 plus sign end cell row cell E degree subscript sel end cell equals cell E degree subscript red minus sign E degree subscript oks end cell row blank equals cell plus 0 comma 34 minus sign left parenthesis minus sign 0 comma 33 right parenthesis end cell row blank equals cell plus 0 comma 34 plus 0 comma 33 end cell row blank equals cell plus 0 comma 67 end cell end table

  • Option C (tidak spontan)

table attributes columnalign right center left columnspacing 0px end attributes row cell Reduksi space open parentheses Katode close parentheses end cell equals cell Pb to the power of 2 plus sign plus up diagonal strike 2 e end strike yields Pb space space E degree equals minus sign 0 comma 33 end cell row cell Oksidasi space open parentheses anode close parentheses end cell equals cell Cu yields Cu to the power of 2 plus sign and up diagonal strike 2 e end strike space space E degree equals plus 0 comma 34 end cell row cell Reaksi space sel end cell equals cell Pb to the power of 2 plus sign and Cu yields Pb and Cu to the power of 2 plus sign end cell row cell E degree subscript sel end cell equals cell E degree subscript kat minus sign E degree subscript anoda end cell row blank equals cell negative sign 0 comma 33 minus sign left parenthesis plus 0 comma 34 right parenthesis end cell row blank equals cell negative sign 0 comma 67 end cell end table

  • Option D (tidak spontan)

table attributes columnalign right center left columnspacing 0px end attributes row cell Reduksi space open parentheses katode close parentheses end cell equals cell 2 Fe to the power of 3 plus sign plus up diagonal strike 2 e end strike yields 2 Fe to the power of 2 plus sign space space E degree equals minus sign 2 comma 87 end cell row cell Oksidasi space open parentheses anode close parentheses end cell equals cell Cu yields Cu to the power of 2 plus sign and up diagonal strike 2 e end strike space space space space space space space space space E degree equals plus 0 comma 34 end cell row cell Reaksi space sel end cell equals cell 2 Fe to the power of 3 plus sign and Cu yields 2 Fe to the power of 2 plus sign and Cu to the power of 2 plus sign end cell row cell E degree subscript sel end cell equals cell E degree subscript red minus sign E degree subscript oks end cell row blank equals cell negative sign 2 comma 87 minus sign left parenthesis plus 0 comma 34 right parenthesis end cell row blank equals cell negative sign 3 comma 21 end cell end table

  • Option E (tidak spontan)

table attributes columnalign right center left columnspacing 0px end attributes row cell Oksidasi space open parentheses anode close parentheses end cell equals cell Cu to the power of plus sign yields Cu to the power of 2 plus sign and up diagonal strike 2 e end strike space space space space space space space space space E degree equals plus 0 comma 16 end cell row cell Reduksi space open parentheses katode close parentheses end cell equals cell 2 Fe to the power of 3 plus sign plus up diagonal strike 2 e end strike yields 2 Fe to the power of 2 plus sign space space space space E degree equals minus sign 2 comma 87 end cell row cell Reaksi space sel end cell equals cell Cu to the power of plus sign and 2 Fe to the power of 3 plus sign yields Cu to the power of 2 plus sign and 2 Fe to the power of 2 plus sign end cell row cell E degree subscript sel end cell equals cell E degree subscript red minus sign E degree subscript oks end cell row blank equals cell negative sign 2 comma 87 minus sign left parenthesis plus 0 comma 16 right parenthesis end cell row blank equals cell negative sign 3 comma 03 end cell end table

Berdasarkan uraian di atas maka, reaksi berikut yang tidak dapat berlangsung adalah pada option A, C, D dan E. 

Jadi, jawaban yang tepat adalah option A, C, D dan E.space

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