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Dengan menggunakan nilai potensial elektrodenya , tentukan reaksi berikut yang dapat berlangsung. a.F2​(g)+CI−(aq)→b.Cl2​(g)+I−(aq)→c.Cl2​(g)+F−(aq)→d.Br2​(g)+Cl−(aq)→

Pertanyaan

Dengan menggunakan nilai potensial elektrodenya bold left parenthesis italic E bold degree bold right parenthesis, tentukan reaksi berikut yang dapat berlangsung.

a point space F subscript 2 open parentheses italic g close parentheses and C I to the power of minus sign left parenthesis italic a italic q right parenthesis rightwards arrow b point space Cl subscript 2 open parentheses italic g close parentheses and I to the power of minus sign left parenthesis italic a italic q right parenthesis rightwards arrow c point space Cl subscript 2 open parentheses italic g close parentheses and F to the power of minus sign left parenthesis italic a italic q right parenthesis rightwards arrow d point space Br subscript 2 open parentheses italic g close parentheses and Cl to the power of minus sign left parenthesis italic a italic q right parenthesis rightwards arrow space 

Pembahasan:

Dibawah ini adalah nilai potensial elektroda halogen:

F subscript 2 open parentheses italic g close parentheses and 2 e to the power of minus sign yields 2 F to the power of minus sign left parenthesis italic a italic q right parenthesis space space space E degree equals plus 2 comma 87 space V Cl subscript 2 open parentheses italic g close parentheses and 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 E degree equals plus 1 comma 36 space V Br subscript 2 open parentheses italic l close parentheses and 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 E degree equals plus 1 comma 07 space V I subscript 2 open parentheses italic s close parentheses and 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 E degree equals plus 0 comma 54 space V 

Dari nilai potensial elektroda tersebut kita dapat menentukan apakah reaksi tersebut dapat berlangsung (reaksi spontan, nilai E degree positif) atau reaksi tidak dapat berlangsung (reaksi tidak spontan, nilai E degree negatif).

a point space F subscript 2 open parentheses italic g close parentheses and 2 C I to the power of minus sign left parenthesis italic a italic q right parenthesis yields 2 F to the power of minus sign left parenthesis italic a italic q right parenthesis plus Cl subscript 2 open parentheses italic g close parentheses space space space space E degree sel double bond E degree subscript reduksi minus sign E degree subscript oksidas i end subscript space space space space E degree sel double bond E degree subscript F subscript 2 vertical line 2 F to the power of minus sign end subscript minus sign E degree subscript Cl subscript 2 vertical line 2 Cl to the power of minus sign end subscript space space space space E degree sel equals plus 2 comma 87 space V minus sign left parenthesis plus 1 comma 36 space V right parenthesis space space space space E degree sel equals plus 2 comma 87 space V minus sign 1 comma 36 space V space space space space E degree sel equals plus 1 comma 51 space V space left parenthesis reaksi space spontan right parenthesis  b point space Cl subscript 2 open parentheses italic g close parentheses and 2 I to the power of minus sign left parenthesis italic a italic q right parenthesis yields 2 Cl to the power of minus sign left parenthesis italic a italic q right parenthesis plus I subscript 2 open parentheses italic s close parentheses space space space space E degree sel double bond E degree subscript reduksi minus sign E degree subscript oksidasi space space space space E degree sel double bond E degree subscript Cl subscript 2 vertical line 2 Cl to the power of minus sign end subscript minus sign E degree subscript I subscript 2 vertical line 2 I to the power of minus sign end subscript space space space space E degree sel equals plus 1 comma 36 space V minus sign left parenthesis plus 0 comma 54 space V right parenthesis space space space space E degree sel equals plus 1 comma 36 space V minus sign 0 comma 54 space V space space space space E degree sel equals plus 0 comma 82 space V space left parenthesis reaksi space spontan right parenthesis  c point space Cl subscript 2 open parentheses italic g close parentheses and 2 F to the power of minus sign left parenthesis italic a italic q right parenthesis yields 2 Cl to the power of minus sign left parenthesis italic a italic q right parenthesis plus F subscript 2 open parentheses italic g close parentheses space space space space E degree sel double bond E degree subscript reduksi minus sign E degree subscript oksidasi space space space space E degree sel double bond E degree subscript Cl subscript 2 vertical line 2 Cl to the power of minus sign end subscript minus sign E degree subscript F subscript 2 vertical line 2 F to the power of minus sign end subscript space space space space E degree sel equals plus 1 comma 36 space V minus sign left parenthesis plus 2 comma 87 space V right parenthesis space space space space E degree sel equals plus 1 comma 36 space V minus sign 2 comma 87 space V space space space space E degree sel equals minus sign 1 comma 51 space V space left parenthesis reaksi space tidak space spontan right parenthesis  d point space Br subscript 2 open parentheses italic l close parentheses and Cl to the power of minus sign left parenthesis italic a italic q right parenthesis yields 2 Br to the power of minus sign left parenthesis italic a italic q right parenthesis plus Cl subscript 2 open parentheses italic g close parentheses space space space space E degree sel double bond E degree subscript reduksi minus sign E degree subscript oksidasi space space space space E degree sel double bond E degree subscript Br subscript 2 vertical line 2 Br to the power of minus sign end subscript minus sign E degree subscript Cl subscript 2 vertical line 2 Cl to the power of minus sign end subscript space space space space E degree sel equals plus 1 comma 07 space V minus sign left parenthesis plus 1 comma 36 space V right parenthesis space space space space E degree sel equals plus 1 comma 07 space V minus sign 1 comma 36 space V space space space space E degree sel equals minus sign 0 comma 29 space V space left parenthesis reaksi space tidak space spontan right parenthesis 

Jadi reaksi berikut yang dapat berlangsung adalah reaksi a dan b karena reaksi-reaksi tersebut memiliki nilai italic E bold degree bold sel postif.space 

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Terakhir diupdate 07 Oktober 2021

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