The Equation Relating The Standard Cell Potential Of A Voltaic Cell To The Standard Reduction Potential Of The Cathode A 1 (56.62 KiB) Viewed 39 times
The Equation Relating The Standard Cell Potential Of A Voltaic Cell To The Standard Reduction Potential Of The Cathode A 2 (48.56 KiB) Viewed 39 times
The equation relating the standard cell potential of a voltaic cell to the standard reduction potential of the cathode and anode reactions is the following. e E cell = Ecathode - Eanode In this equation Ecell is the standard cell potential, Ecathode is the standard reduction potential of the cathode reaction, and Eanode is the standard reduction potential of the reverse of the anode reaction (the reduction corresponding to the reverse of the oxidation reaction). Use this relationship to solve the problem below. The standard reduction potential for Na+ (aq) is -2.71 V. The half-reaction for the reduction of Na*(aq) is the following. Na + (aq) + e Na(s) The standard reduction potential for Sn4+ (aq) is 0.15 V. The half-reaction for the reduction of Sn4+ (aq) is the following. Sn+ (aq) + 2e → Sn²+ (aq) Using this information, calculate Ecell for the voltaic cell powered by the following spontaneous redox reaction. Sn4+ (aq) + 2 Na(s) 2 Na+ (aq) + Sn²+ (aq) → 40 3.01 X V Did you remember how to use the redox reaction equation to determine which half-reaction occurs as an oxidation and which half-reaction occurs as a reduction? Did you remember to assign the oxidation half-reaction to the anode of the voltaic cell? Did you recall that although both reduction and oxidation reactions occur in the voltaic cell, the equation for E cell uses reduction potentials only? Even though one of the half-reactions is an oxidation reaction, it is the reduction potential that is used in the equation. Also note that the given reduction potentials do not have to be "corrected" for their stoichiometry in the overall redox reaction.
For a nickel-zinc voltaic cell containing Ni2+ (aq) and Zn2+ (aq) solutions, do the following. (a) Identify the cathode. (Include states-of-matter under the given conditions in your answer. Type INERT if an inert electrode must be used.) chemPad XX Greek Ni2+ (aq) + 2e → Ni(s) Ni^2+(aq) + 2e^>Ni(s) Your answer contains a state-of-matter where it was not expected. chemPad XoXº (b) Identify the half-reaction that occurs at the cathode. (Include states-of-matter under the given conditions in your answer.) Help Help Greek Did you remember that a voltaic cell contains two half-reactions, one oxidation and one reduction? Did you remember that reduction occurs when a chemical species gains electrons, and oxidation occurs when it loses electrons? Did you recall the relationship between standard reduction potential and oxidation-reduction? Supporting Materials
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