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REDOKS KELAS 10 KIMIA SMA SEMESTER 2 REDUKSI DAN OKSIDASI
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REAKSI REDOKS DAN ELEKTROKIMIA Disusun Oleh : Kelompok 2
Mata Kuliah: Teknik Teknik Korosi (MKK 145034 145 034 ) Dosen : Bambang Eko,S.Pd
PROGRAM STUDI PENDIDIKAN TEKNIK MESIN (PTM) SEKOLAH TINGGI KEGURUAN DAN ILMU PENDIDIKAN (STKIP) SEBELAS APRIL SUMEDANG 2014-2015
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RUMUSAN MASALAH 1.
Apa yang dimaksud dengan Reaksi Redoks ?
2.
Apa yang dimaksud Elektrokimia ?
3.
Apa yang dimaksud Sel volta?
4.
Apa yang dimaksud Sel Elektrolisis ?
5.
Bagaimana cara menyetarakan reaksi redoks ?
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Reaksi kimia dapat digolongkan menjadi berbagai macam reaksi. Salah satu diantaranya adalah reaksi yang y ang berkaitan dengan perubahan bilangan oksidasi dari atom-atom sebelum dan sesudah reaksi. Dari tinjauan bilangan oksidasi reaksi dapat dibedakan menjadi 2 jenis reaksi yaitu : 1. Golongan reaksi dimana atom-atom yang terlibat tidak mengalami perubahan bilangan oksidasi oksidasi sebelum dan sesudah reaksi. Reaksi dimana atom-atom yang terlibat tidak mengalami perubahan bilangan oksidasi disebut reaksi bukan reduksi-oksidasi yang lazim disebut reaksi bukan redoks. 2. Golongan reaksi dimana diantara atom-atom yang terlibat ada yang mengalami perubahan bilangan oksidasi. Sebelum dan sesudah reaksi bilangan oksidasi atom-atom yang terlibat tidak sama (berubah). Reaksi ini
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1. Konsep Reduksi Oksidasi (Redoks) Pada mulanya, pembahasan reaksi redoks hanya meliputi zat – zat yang mengandung oksigen saja. Reaksi oksidasi dianggap sebagai reaksi penambahan oksigen, dan reaksi reduksi adalah reaksi pengurangan oksigen. Tetapi, Tetapi, saat ini pengertian redoks diperluas menjadi reaksi perpindahan elektron. Reaksi oksidasi adalah peristiwa pelepasan elektron, dimana suatu zat memberikan elektron kepada lainnya. Contoh : Cu Cu2+ + 2eSedangkan reaksi reduksi adalah peristiwa penangkapan elektron, dimana suatu zat menerima elektron dari zat lain. l ain. Contoh : Cu 2+ + 2e- Cu Senyawa yang mengalami oksidasi disebut sebagai reduktor, dan –
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2. Penyetaraan Reaksi Redoks Reaksi redoks dapat disetarakan dengan cara langsung (cara bilangan oksidasi) atau cara setengah reaksi. 2.1. Cara Langsung (Bilangan Oksidasi)
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2.2 Cara Setengah Reaksi Untuk menyelesaikan persamaan redoks dengan cara setengah reaksi, maka langkah – langkah yang dilakukan adalah : Tabel 1. Penyetaraan Reaksi Redoks dengan Cara Setengah Reaksi
Reaksi Suasana Asam Tulis masing
Reaksi Suasana Basa
masing reaksi reduksi
–
dan oksidasi Setarakan
Tulis masing
masing reaksi reduksi
–
dan oksidasi jumlah
elektron
yang
Setarakan
jumlah
elektron
yang
terlibat
terlibat
Tambahkan satu molekul H2O pada
Tambahkan dua molekul OH- pada
ruas yang kekurangan satu atom O
ruas yang kekurangan satu atom O
Tambahkan satu molekul H+ pada
Tambahkan molekul H O pada ruas
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3. Elektrokimia Elektrokimia adalah bidang ilmu kimia yang mempelajari perubahan energi kimia menjadi energi listrik atau sebaliknya. 3.1. Sel sel Elektrokimia PENGERTIAN SEL ELKTROKIMIA Transfer elektron pada reaksi redoks dalam larutan berlangsung –
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SEL VOLTA Sel Volta (sel galvani) memanfaatkan reaksi spontan (∆G < 0) untuk membangkitkan energi listrik, selisih energi reaktan (tinggi) dengan produk (rendah) diubah menjadi energi listrik. Sistem reaksi melakukan kerja terhadap lingkungan Sel Elektrolisa memanfaatkan energi listrik untuk menjalankan reaksi non spontan (∆G > 0) lingkungan melakukan kerja terhadap sistem Kedua tipe sel menggunakan elektroda, yaitu zat yang menghantarkan listrik antara sel dan lingkungan dan dicelupkan dalam elektrolit (campuran ion) yang
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Sel Volta terdiri atas elektroda (logam seng dan tembaga) larutan elektrolit (ZnSO4 dan CuSO4), dan
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3.2. Potensial Elektroda Standar (Eo) Potensial elektroda standar suatu elektroda adalah daya gerak listrik yang timbul karena pelepasan elektron dari reaksi reduksi. Karena itu, potensial elektroda standar sering juga disebut potensial reduksi standar.. Potensial ini relatif karena dibandingkan dengan elektroda standar
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