M5S18 – Electrode Potentials 3

What temperature is required for the determination of a standard cell potential, E^ϴcell/V?

[1] 298K

[2] 20^oC

[3] 273K

[4] 298 ^oC

What is the value of E^ϴcell/V observed for a cell constructed from the following half-cells?

Zn²⁺_(aq) + 2e^- <=> Zn_(s) E^ϴcell/V = -0.76

Cu²⁺_(aq) + 2e^- <=> Cu_(s) E^ϴcell/V = +0.34

Consider a cell constructed from the following half-cells:

Zn²⁺_(aq) + 2e^- <=> Zn_(s) E^ϴ/V = -0.76

Cu²⁺_(aq) + 2e^- <=>Cu_(s) E^ϴ/V = +0.34

If the solution of Cu²⁺_(aq) was 0.50 mol dm^-3, would you expect to see a greater or smaller value of E^ϴcell/V than you would if the cell was set-up under standard conditions?

Consider a cell constructed from the following half-cells:

Zn²⁺_(aq) + 2e^- <=> Zn_(s) E^ϴ/V = -0.76

Cu²⁺_(aq) + 2e^- <=>Cu_(s) E^ϴ/V = +0.34

Which half-cell will form the cathode in this cell? Think very carefully about the definition of a cathode!

For this question, look at the resource, ‘A Selection of Standard Electrode Potentials’ (‘A Selection of Standard Electrode Potentials’can be found in TOOLS>Data Sheets)

Which chemical species is reduced most easily?

For this question, look at the resource, ‘A Selection of Standard Electrode Potentials’ (‘A Selection of Standard Electrode Potentials’can be found in TOOLS>Data Sheets)

Which chemical species is most resistant to reduction?

For this question, look at the resource, ‘A Selection of Standard Electrode Potentials’ (‘A Selection of Standard Electrode Potentials’can be found in TOOLS>Data Sheets)

Which chemical species is most resistant to oxidation?

For this question, look at the resource, ‘A Selection of Standard Electrode Potentials’ (‘A Selection of Standard Electrode Potentials’can be found in TOOLS>Data Sheets)?

Can MnO₄^-_(aq) oxidise water into H₂O_2(aq) in acidic condition?

Consider a cell constructed from the following half-cells:

Cu²⁺_(aq) + 2e^- <=> Cu_(s) E^ϴ/V = +0.34

Ag⁺_(aq) + e^- <=> Ag_(s) E^ϴ/V = +0.80

Which half-cell forms the anode in this cell? Be very careful with your definition of cathode!

Consider the following 3 equilibria, all involving metallic copper or its ions:

Cu²⁺_(aq) + e^- <=> Cu⁺_(aq) E^ϴ/V = +0.15

Cu²⁺_(aq) + 2e^- <=> Cu_(s) E^ϴ/V = +0.34

Cu⁺_(aq) + e^- <=> Cu_(s) E^ϴ/V = +0.52

An aqueous solution of the colourless compound, CuCl_(s) was prepared and the solution was left to stand for a period in a sealed colourless glass bottle.

After the solution was left to stand, the contents of the bottle would have the following appearance: