1) Using the reduction potentials table in the notes/book, what is the standard
ID: 881679 • Letter: 1
Question
1) Using the reduction potentials table in the notes/book, what is the standard cell potential for the following electrochemical cell:
Al(s) | Al3+(aq) || Ni2+(aq) | Ni(s)
2) Using the standard reduction potentials table in your book/notes, what is the standard change in gibbs free energy for the following reaction in kJ?
2NO3-(aq) + 8H+(aq) + 3Cu(s) 3Cu2+(aq) + 2NO(g) + 4H2O(l)
3) A voltaic cell is set-up with a silver electrode in a silver nitrate solution and a nickel electrode in a nickel (II) nitrate solution. What is the reaction occuring at the anode? Use the reduction potentials table in the notes/book.
Explanation / Answer
1) E^0 CELL = E^0 (Ni^+2 /Ni) - E^0 (Al^+3/Al)
= -0.23-(-1.66)
=1.43V
2)
E^0 CELL = E^0 (NO3^-1 /NO) - E^0 (Cu^+2/Cu)
= 0.96-(0.34)
= 0.62V
DG = -nF E^0 CELL
= -(2*96500*0.62)
= -119660 J
= -119.66kJ
3) THE ELECTRODE WHICH HAS LOWER REDUCTION POTENTIAL THAT CAN BE ACTS AS A ANODE
THERFOER NICKEL ELECTRODE HAS LOWER REDCTION POTENTIAL THA SILVER.HENCE THE REACTION AT ANODE IS
Ni(s) -------------------------> Ni^+2 (aq)
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