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What is the standard reduction potential of the Y3+/Y redox couple if the cell potential of...

What is the standard reduction potential of the Y3+/Y redox couple if the cell potential of the following cell at 25 oC is 1.22 V?

Zn / Zn2+ (0.72 M) // Y3+ (1.2 M) / Y

Eo =

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