Question

4. Determine the standard cell potential for each of the electrochemical cells. 2Ag(s) + Pb2+(aa) 2" (ac) + 2(s) a. 2Ag1+(aa) + Pb(s) 2(g) (ac) 2+ (ag)

Answer 1

a. Pb(s) ---------------> Pb^2+ (aq) + 2e^-         E0 = 0.13v

     2Ag^+ (aq) + 2e^- --------> 2Ag(s)               E0 = 0.80v

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Pb(s) + 2Ag^+ (aq) ----------> Pb^2+ (aq) + 2Ag(s)    E0cell = 0.93v

b.

   2I^- ---------------> I2(s) + 2e^-             E0 = -0.54v

2ClO2(g) + 2e^- ------> 2ClO2^-            E0 = 0.95v

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2ClO2(g) + 2I^- (aq) ------------> 2ClO2^- (aq) + I2(s)     E0cell = 0.41v

C.

2Zn(s) ---------------------> 2Zn^2+ (aq) + 4e^-               E0 = 0.76v

O2(g) + 4H^+ (aq) --------> 2H2O(l)                              E0 = 1.23v

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2Zn(s) + O2(g) + 4H^+ (aq) ---------> 2Zn^2+ (aq0 + 2H2O(l)     E0cell = 1.99v