Problem: Calculate Eocell for the following balanced redox reaction.Br2(l) + 2I−(aq) → 2Br−(aq) + I2(s)Express your answer using two significant figures.

FREE Expert Solution

E°cell=E°cathode-E°anode  


Recall:

Lose               Gain
Electron         Electrons
Oxidation       Reduction

cathode → reduction → oxidation number decreases

anode → oxidation → oxidation number increases

For ions: charge of the ion = oxidation number
For neutral atoms/compound: oxidation number = 0


Half-cell reactions:

  • Br2(l) → 2Br(aq) 
    • charge changed from 0 to -1
      • Br2 = 0, Br= -1
    •  oxidation number decreased → gained electrons → reduced → cathode
  • 2I(aq)   I2(s)
    • charge changed from -1 to 0
      • I= -1, I2 = 0
    •  oxidation number increased → lost electrons → oxidized → anode
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Problem Details

Calculate Eocell for the following balanced redox reaction.

Br2(l) + 2I(aq) → 2Br(aq) + I2(s)

Express your answer using two significant figures.

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