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Na(aq)++e−→Na(s)Eo=−2.71VNa^+_{(aq)} +e^- \to Na_{(s)} \hspace{40pt} E^o=-2.71VNa(aq)++e−→Na(s)Eo=−2.71V
S2O8(aq)2−+2e−→2SO4(aq)2−Eo=2.01VS_2O_{8(aq)}^{2-} +2e^- \to 2SO_{4(aq)}^{2-} \hspace{20pt} E^o=2.01VS2O8(aq)2−+2e−→2SO4(aq)2−Eo=2.01V
I2(s)+2e−→2I(aq)−Eo=0.54VI_{2(s)}+2e^- \to 2I^-_{(aq)} \hspace{43pt} E^o=0.54VI2(s)+2e−→2I(aq)−Eo=0.54V
Ni(aq)2++2e−→Ni(s)Eo=−0.23VNi_{(aq)}^{2+} +2e^- \to Ni_{(s)} \hspace{35pt} E^o=-0.23VNi(aq)2++2e−→Ni(s)Eo=−0.23V
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Electrochemistry: Reduction potentials in a Galvanic Cell
Use the standard reduction potentials below to answer the following question: which metal could be used to create a sacrificial anode for an aluminum pipe?
Reduction half−reactionE°(V)𝐶𝑎2+(𝑎𝑞)+2𝑒−⇌𝐶𝑎(𝑠)−2.87𝑁𝑎+(𝑎𝑞)+𝑒−⇌𝑁𝑎(𝑠)−2.71𝐴𝑙3+(𝑎𝑞)+3𝑒−⇌𝐴𝑙(𝑠)−1.66𝑀𝑛2+(𝑎𝑞)+2𝑒−⇌𝑀𝑛(𝑠)−1.18𝐶𝑢2+(𝑎𝑞)+2𝑒−⇌𝐶𝑢(𝑠)+0.15𝐴𝑔+(𝑎𝑞)+𝑒−⇌𝐴𝑔(𝑠)+0.80\begin{array}{c:c}\rm Reduction\ half-reaction& E° (V)\\ \hline 𝐶𝑎^{2+} (𝑎𝑞)+2 𝑒^−⇌𝐶𝑎 (𝑠)& -2.87\\ \hline 𝑁𝑎^+ (𝑎𝑞)+𝑒^−⇌𝑁𝑎 (𝑠)&-2.71\\ \hline 𝐴𝑙^{3+} (𝑎𝑞)+3 𝑒^−⇌𝐴𝑙(𝑠) &-1.66\\ \hline 𝑀𝑛^{2+} (𝑎𝑞)+2 𝑒^−⇌𝑀𝑛 (𝑠)&-1.18\\ \hline 𝐶𝑢^{2+} (𝑎𝑞)+2 𝑒^− ⇌𝐶𝑢 (𝑠) &+0.15\\ \hline 𝐴𝑔^+ (𝑎𝑞)+𝑒^− ⇌𝐴𝑔 (𝑠)&+0.80\end{array}Reduction half−reactionCa2+(aq)+2e−⇌Ca(s)Na+(aq)+e−⇌Na(s)Al3+(aq)+3e−⇌Al(s)Mn2+(aq)+2e−⇌Mn(s)Cu2+(aq)+2e−⇌Cu(s)Ag+(aq)+e−⇌Ag(s)E°(V)−2.87−2.71−1.66−1.18+0.15+0.80
A voltaic cell is constructed with an Sn/Sn2+ half-cell and a Zn/Zn2+ half-cell. The zinc electrode is negative.
Write a balanced overall reaction for this cell
Draw a diagram of this cell, labeling electrodes with their charges and showing the direction of electron flow in the wire and anion/cation flow in the salt bridge
Choose the INCORRECT statement
Electrochemistry: Galvanic Cells
Construct a galvanic cell with the highest voltage given the following half reactions. Determine the voltage produced and express it in standard cell notation.
Electrochemistry: Galvanic Cell
In a zinc-lead cell the reaction is:
Pb2+(aq)+Zn(s)→Pb(s)+Zn2+(aq) E°=0.637VPb^{2+}\left(aq\right)+Zn\left(s\right)\to Pb\left(s\right)+Zn^{2+}\left(aq\right)\ \ \ \ \ \ \ E\degree=0.637VPb2+(aq)+Zn(s)→Pb(s)+Zn2+(aq) E°=0.637V
Which of the following statements about this cell is FALSE?
In a galvanic cell, oxidation occurs at the:
Electrochemistry: Ksp calculations
Use the following reduction potentials to calculate the Ksp of La(OH)3(s)
Electrochemistry: Battery
Given the following half cells, what is the maximum voltage of a battery that could be constructed?
Electrochemistry: Standard Reduction Potentials
A galvanic cell is constructed from chromium and copper electrodes immersed in aqueous solutions of Cr3+and Cu2+ respectively (half-reactions shown below).
Cr3+(aq)+3e−⇌Cr(s)Cr^{3+}(aq)+3e^-⇌Cr(s)Cr3+(aq)+3e−⇌Cr(s) E°red=−0.74VE°_{red}=-0.74VE°red=−0.74V
Cu2+(aq)+2e−⇌Cu(s)Cu^{2+}(aq)+2e^-⇌Cu(s)Cu2+(aq)+2e−⇌Cu(s) E°red=+0.34VE°_{red}=+0.34VE°red=+0.34V
Practice: Galvanic Cells
Galvanic Cell Practice
Write the cell notation for the voltaic (or galvanic) cell that incorporates the following redox reaction:
Al(s)+Cr(aq)3+→Al(aq)3++Cr(s)Al_{(s)}+Cr^{3+}_{(aq)} \to Al^{3+}_{(aq)}+Cr_{(s)}Al(s)+Cr(aq)3+→Al(aq)3++Cr(s)
Al3+ +3e -> Al(s) Eored=-1.66V
Write the cell notation for the voltaic cell that incorporates each of the following redox reactions:
Cu(aq)2++SO2(g)+2H2O(l)→Cu(s)+SO4(aq)2−+4H(aq)+Cu^{2+}_{(aq)}+SO_{2(g)}+2H_2O_{(l)} \to Cu_{(s)}+SO^{2-}_{4(aq)}+4H^+_{(aq)}Cu(aq)2++SO2(g)+2H2O(l)→Cu(s)+SO4(aq)2−+4H(aq)+