A Pt wire is immersed in a solution containing V2+ and V3+ at equal activities of 0.01000. This half-cell is connected through a salt bridge to a Ag-AgBr half-cell in which aBr-= 0.100. The EMF of this galvanic cell is measured to be 0.385 V at 25 C and the electrode in the vanadium solution is the negative electrode. What is the standard electrode potential of the V2+-V3+ electrode? Write out the galvanic cell reaction.

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