Given the cell notation, Pt (s) | Br- (aq) | Br2(l) || Co2+ (aq), Co3+ (aq) | Pt

Question

Given the cell notation,

Pt (s) | Br- (aq) | Br2(l) || Co2+ (aq), Co3+ (aq) | Pt (s)

a)write the two half half reaction that are taking place.

b) label which of them occurs at the anode, and which at the cathode.

Please explain, Thank you.

TABLE 17.1 Standard Reduction Potentials at 25°C (298 K) for Many Common Half-Reactions Half-Reaction 8° (V) Half-Reactio 0.40 0.34 0.27 0.22 0.20 2.87 O2 + 2H20 +4e4OH 1.82 1.78 1.70 1.69 1.68 1.60 1.51 0.00 0.036 2H' + 2e- H, Ll Sn2+ + 2e- Sn 1.46 1.36 1.33 1.23 1.21 1.20 1.09 1.00 0.99 0.96 0.954 0.91 0.80 0.80 0.77 0.68 0.56 0.54 0.52 -0.23 0.35 -0.40 0.44 0.50 0.73 0.76 0.83 1.18 C1, + 2e- 2Cl Mid), + 4H + + 2e Mn2+ 2H2O 2H,() + 2e- H2 + 20H Al3+ + 3e Al Mg2+ + 2e Mg 2.23 2.37 -2.37 2.71 -2.76 2.90 2.92 3.05 02 + 2H' +2e H,02 Li Cu e

Explanation / Answer

Solution :-

For the given cell notation

Pt (s) | Br- (aq) | Br2(l) || Co2+ (aq), Co3+ (aq) | Pt (s)

Br^- is oxidized to Br2 and Co^3+ will reduce to Co^2+

a)write the two half half reaction that are taking place.

Half reactions are

2Br^- ------ > Br2 + 2e-

Co^3+ +e- ----- > Co^2+

b) label which of them occurs at the anode, and which at the cathode.

2Br^- ------ > Br2 + 2e-   = Anode

Co^3+ +e- ----- > Co^2+   = Cathode

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