The standard reduction potential for i2/i– is +0.54v, and the standard reduction potential for br2/br- is +1.07v. which reaction occurs when bromine is added to an aqueous solution of iodide ions?

The standard reduction potential of Br2/Br- is higher than that of I2/I-, which means Br2 has a higher tendency of gaining an electron and forming Br- than I2 does.  Therefore when Br2 and I- are present in the same solution, Br2 will gain electrons from I- and form Br-, meanwhile I- loses electrons and forms I2.

Br2 + 2I- = 2Br- + I2

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