5. Determine whether the following pairs have a spontaneous reaction when found

Question

5. Determine whether the following pairs have a spontaneous reaction when found in the same beaker. If the reaction is spontaneous write the net ionic equation. a) aluminum ions and iron metal b) gold metal and magnesium ions c) magnesium metal and lead ions 6. The following questions are about this cell: AllAI iPb Pb a. Identify the anode and the cathode. b. Write the balanced overall (net) reaction. c. What is the potential of this cell under standard conditions? d. Which electrode is inert, Al or Pb?

Explanation / Answer

5)

a) no reaction

b) no reaction

c) Mg(s) + Pb2+(aq)-------------> Mg2+(aq) + Pb(s)

6)

a) Al is anode and Pb is cathode

b) 2Al(s) + 3Pb2+(aq) ----------------> 2Al3+(aq) + 3Pb(s)

c) E°cell = -0.126 - (-1.66) = 1.534 V

d) Pb

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