Question

A half-cell containing Hg2 +2 and Hg is connected to a half-cell containing Mg+2 and Mg to form a voltaic cell. Determine the proper direction for each half-cell reaction to assure a spontaneous, complete cell reaction. Find the value of the complete cell electrode potential (E°).

Answer 1

Look up the standard reduction potentials for

Br and Mg. I find the following:Mg2+ +2e-=>

Mgls) E = -2.38 VBr2() +2e-==> 2Br-(aq) E°