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A galvanic cell consists of a Mg2+/Mg half-cell and a standard hydrogen electrod

ID: 1024061 • Letter: A

Question

A galvanic cell consists of a Mg2+/Mg half-cell and a standard hydrogen electrode. If the Mg2+/Mg half-cell standard cell functions as the anode, and the standard cell potential is 2.37 V, what is the standard reduction potential for the Mg2+/Mg half-cell? A galvanic cell consists of a Mg2+/Mg half-cell and a standard hydrogen electrode. If the Mg2+/Mg half-cell standard cell functions as the anode, and the standard cell potential is 2.37 V, what is the standard reduction potential for the Mg2+/Mg half-cell? -2.37 V -1.18 V +2.37 V +1.18 V

Explanation / Answer

A galvanic cell consists of a Mg2+/Mg half-cell and a standard hydrogen electrode.

for  Mg2+/Mg half-cell , E0cell = 2.37 V

and

for a standard hydrogen electrode, E0cell = 0.0 V

therefore

EoCell = EoCathode EoAnode

= 0.0 V - 2.37 V

= - 2.37 V

the standard reduction potential for the Mg2+/Mg half-cell is - 2.37 V

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