In a galvanic cell, one half-cell consists of a cobalt strip dipped into a 1.00 M...
In a galvanic cell, one half-cell consists of a cobalt strip dipped into a 1.00 M solution of Co(NO3)2. In the second half-cell, solid niobium is in contact with a 1.00 M solution of Nb(NO3)3. Co is observed to plate out as the galvanic cell operates, and the initial cell voltage is measured to be 0.819 V at 25°C.
(a) Write balanced equations for the half-reactions at the anode and the cathode. Show electrons as e-.
Use the smallest integer coefficients possible and the pull-down boxes to indicate states.
Half-reaction at anode (do not multiply by factor): ________+________------->________ +________
Half-reaction at cathode (do not multiply by factor): ________+________----->__________+_________
(b) Calculate the standard reduction potential of a Nb3+|Nb half-cell. The standard reduction potential of the Co2+|Co electrode is -0.280 V.
________ V
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