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Diketahui: \( \mathrm{I}_{2(\mathrm{~s})}+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{I}_{(\mathrm{aq})}^{( } \) \[ \mathrm{E}^{\circ}=+0,54 \mathrm{~V} \] \( \mathrm{F}_{2(\mathrm{~g})}+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{~F}^{-}(\mathrm{aq}) \) \[ \mathrm{E}^{\circ}=+2,87 \mathrm{~V} \] Potensial sel adalah perbedaan tegangan yang dihasilkan oleh suatu sel elektrokimia akibat reaksi redoks yang terjadi di dalamnya. Besar potensial sel untuk reaksi \( 2 \mathrm{I}_{(\mathrm{as})}^{-}+\mathrm{F}_{2(\mathrm{~g})} \rightarrow \mathrm{I}_{2(\mathrm{~s})} \) \( +2 \mathrm{~F}^{(19)} \) adalah .... A. \( +2,33 \) volt B. \( +1,90 \) volt C. \( +1,51 \) volt D. \( +1,10 \) volt E. \( -1,51 \) volt

Ask by Welch Smith. in Indonesia
Mar 18,2025

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Potensial sel untuk reaksi tersebut adalah \(+2{,}33\) volt, jadi jawaban yang benar adalah A.

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Untuk menghitung potensial sel (\(E^{\circ}_{\text{sel}}\)) yang dihasilkan oleh reaksi \(2 \mathrm{I}_{(\mathrm{aq})}^- + \mathrm{F}_{2(\mathrm{g})} \rightarrow \mathrm{I}_{2(\mathrm{s})} + 2 \mathrm{F}^-\), kita bisa menggunakan rumus: \[ E^{\circ}_{\text{sel}} = E^{\circ}_{\text{katoda}} - E^{\circ}_{\text{anoda}} \] Di sini, \(E^{\circ}_{\text{katoda}}\) adalah potensial reduksi dari fluor (F) dan \(E^{\circ}_{\text{anoda}}\) adalah potensial reduksi dari yodium (I). Berdasarkan data yang diberikan: - \(E^{\circ}_{\text{katoda}} = E^{\circ}(\mathrm{F}) = +2,87 \, \mathrm{V}\) - \(E^{\circ}_{\text{anoda}} = E^{\circ}(\mathrm{I}) = +0,54 \, \mathrm{V}\) Maka, substitusi ini memberikan: \[ E^{\circ}_{\text{sel}} = 2,87 \, \mathrm{V} - 0,54 \, \mathrm{V} = 2,33 \, \mathrm{V} \] Sehingga, jawabannya adalah A. \( +2,33 \) volt. Penting untuk diingat bahwa proses ini menggambarkan bagaimana energi dari reaksi dapat diubah menjadi energi listrik melalui reaksi redoks!

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