The value for the standard emf (electromotive force) of agalvanic cell described

Question

The value for the standard emf (electromotive force) of agalvanic cell described by the cell notation is -0.25 V. Determinethe value (V) of the standard electrode potential for theMnO2/Mn2+ couple.

Pt(s) l Pb2+(aq) l PbO2(s) lH+(aq) ll H+(aq) l MnO2(s) lMn2+(aq) l Pt(s) St. Red. Pot. (V) PbO2/Pb2+ 1.46 The value for the standard emf (electromotive force) of agalvanic cell described by the cell notation is -0.25 V. Determinethe value (V) of the standard electrode potential for theMnO2/Mn2+ couple.

Pt(s) l Pb2+(aq) l PbO2(s) lH+(aq) ll H+(aq) l MnO2(s) lMn2+(aq) l Pt(s) St. Red. Pot. (V) PbO2/Pb2+ 1.46 St. Red. Pot. (V) PbO2/Pb2+ 1.46

Explanation / Answer

Ecell=-.25 = 1.46 + x x=- 1.71 V

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