CELL POTENTIALS

CELL POTENTIALS - Determination of the standard cell...

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Determination of the standard cell potential: The books versions: Given two ½ reactions: 1) A + B Æ C + D ξ ° = 1 2) E + F Æ G + H ξ ° = 2 #1 Determine the greater of the two cell potentials. Answer: 2) #2 Flip the ½ reaction of the smaller cell potential, but maintain the cell potential. 1) C + D Æ A + B ξ ° = 1 #3 Add the flipped ½ reaction to the other ½ reaction 1) C + D Æ A + B 2) E + F Æ G + H C + D + E + F Æ A + B + G + H #4 To determine the overall cell potential subtract the cell potential of 1) from 2) ξ ° Total = ξ ° R - ξ ° L = 2-1 = 1
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