1. What is the pH of the solution in the anode compartment of the following cell
ID: 989734 • Letter: 1
Question
1. What is the pH of the solution in the anode compartment of the following cell if the measured cell potential at 25 C is 0.24 V ?
Pt(s)|H2(1atm)|H+(?M)||Pb2+(1M)|Pb(s)
2. What is the pH of the solution in the cathode compartment of the following cell if the measured cell potential at 25 C is 0.55 V ?
Zn(s)Zn2+(1M)H+(?M)H2(1atm)|Pt(s)
3. For the reaction N2(g) + 2 O2(g) 2 NO2(g), G° = 102.6 kJ. At 25°C the equilibrium constant K p = ________
4. A galvanic cell uses the reaction
Mg(s) + Pb2+(aq) Mg2+(aq) + Pb(s).
Mg(s) Mg2+(aq) + 2 e- is the ________ half-reaction, which occurs at the ________.
Explanation / Answer
3. G° = -RTlnKp
Kp = e^((-G°)/(RT))
Kp = e^((-102600 J)/(8.314 J/mol.K*298K)) = 1.036 * 10-18
4. Mg(s) Mg2+(aq) + 2 e- is the Oxidation half-reaction, which occurs at the Anode
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