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lecture9electrochem - Electrochemistry Redox reactions...

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Electrochemistry Redox reactions Balance in acidic/basic solution Half reactions Voltaic cells Terminologies Cell potential, emf Cell notations Standard Reduction Potential & SHE
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2 Redox Reactions have both oxidation and reduction (electron transfer reaction) split reaction into oxidation half-reaction and a reduction half-reaction oxidizing agent is reactant molecule that causes oxidation contains the element reduced reducing agent is reactant molecule that causes reduction contains the element oxidized
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3 Oxidation and Reduction oxidation and reduction must occur simultaneously if an atom loses electrons another atom must take them
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4 Balancing Redox Reactions assign oxidation numbers determine element oxidized and element reduced write ox. & red. half-reactions. balance half-reactions by mass first balance elements other than H and O add H 2 O where need O add H + where need H neutralize H + with OH - in base balance half-reactions by charge balance charge by adjusting electrons, ox. electrons on right, red. electrons on left of arrow balance electrons between the two half-reactions add half-reactions & check
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5 Exercise: Balance the equation: I ( aq ) + MnO 4 ( aq ) I 2( aq ) + MnO 2( s ) in basic solution Assign Oxidation States Separate into half-reactions ox: I ( aq ) I 2( aq ) red: MnO 4 ( aq ) MnO 2( s ) & balance by mass 2 + 2 H 2 O ( l ) & then O by adding H 2 O & then H by adding H + 4 H + ( aq ) +
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