1) The standard emf for the cell using the overall cell reaction below is +0.48
ID: 922361 • Letter: 1
Question
1) The standard emf for the cell using the overall cell reaction below is +0.48 V: Zn(s) + Ni2+(aq) Zn2+(aq) + Ni(s) The emf generated by the cell when [Ni2+] = 2.50 M and [Zn2+] = 0.100 M is
A) 0.52
B) 0.50
C) 0.44
D) 0.40
E) 0.56
2) What is the standard cell potential for the voltaic cell formed from a Cu/Cu+ half-cell (E°=0.52 V) and a Sn2+/Sn4+ half-cell (E°=0.15 V)?
A) +0.67 V
B) -0.37 V
C) -0.67 V
D) +0.37 V
3) What is the reducing agent in the redox reaction represented by the following cell notation?
Mg(s) | Mg 2+(aq) || Ag+(aq) | Ag(s)
A) Pt
B) Mg 2+(aq)
C) Mg(s)
D) Ag(s)
E) Ag+(aq)
4) Which reaction could be used to generate electricity in a voltaic electrochemical cell?
A) Zn2+(aq)+Sn(s)Sn2+(aq)+Zn(s) B) Pb2+(aq)+Mg(s)Mg2+(aq)+Pb(s) C) NaCl(aq)+AgNO3(aq)AgCl(s)+NaNO3(aq) D) None of the aboveExplanation / Answer
1) E = 0.38 - (0.059/2)*log(0.1/2.5)
=0.421
2) Eo = 0.52-0.15
=0.37
3)since Mg gives out electrons, it is the reducing reagent.
4)Pb2+(aq)+Mg(s)Mg2+(aq)+Pb(s) could be used to generate electricity since the Eo of the cell is positive.
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