In the following spontaneous voltaic cell, which of the following statements are TRUE? Select as many answers as are correct however points will be deducted for incorrect guesses.Zn(s)|Zn2+(aq)||H+(aq)|H2(g)|Pt(s) Question 2Select one or more:Eºcell is negativeZn/Zn2+ is the anodeZn/Zn2+ is the cathodeEºcell is positiveH+/H2 is the cathodeH+/H2 is the anode
Question
In the following spontaneous voltaic cell, which of the following statements are TRUE? Select as many answers as are correct however points will be deducted for incorrect guesses.Zn(s)|Zn2+(aq)||H+(aq)|H2(g)|Pt(s) Question 2Select one or more:Eºcell is negativeZn/Zn2+ is the anodeZn/Zn2+ is the cathodeEºcell is positiveH+/H2 is the cathodeH+/H2 is the anode
Solution
In a spontaneous voltaic cell, the following statements are true:
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Zn/Zn2+ is the anode: In a voltaic cell, oxidation occurs at the anode. In this cell, Zn is being oxidized to Zn2+, so Zn/Zn2+ is the anode.
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H+/H2 is the cathode: In a voltaic cell, reduction occurs at the cathode. In this cell, H+ is being reduced to H2, so H+/H2 is the cathode.
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Eºcell is positive: For a spontaneous reaction in a voltaic cell, the standard cell potential (Eºcell) is positive. This is based on the equation ΔGº = -nFEºcell, where ΔGº is the standard Gibbs free energy change, n is the number of moles of electrons transferred, F is the Faraday constant, and Eºcell is the standard cell potential. A spontaneous reaction has a negative ΔGº, so Eºcell must be positive for the equation to hold true.
The statements "Eºcell is negative" and "Zn/Zn2+ is the cathode" are not true for this voltaic cell.
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