Chem 2 tute sheet week 6 – Electrochemistry

  1. Zinc reacts spontaneously with the silver ion:

Zn­(s) + 2Ag+(aq) →  Zn2+(aq) + 2Ag(s)

Describe a voltaic cell using this reaction. What are the half reactions?

  1. Consider the cell :

Cd(s)|Cd2+(aq)||Ni2+(aq)|Ni(s)

Write the half cell reactions and the overall cell reaction. Make a sketch of this cell and label it. Include labels showing the anode, cathode, and direction of the electron flow.

3.

Standard reduction potentials are 2.9 V for F2/F-, 0.8 V for Ag+/Ag, 0.5 V for Cu+/Cu, 0.3 V for Cu2+/Cu, -0.4 V for Fe2+/Fe, -2.7 V for Na+/Na, and -2.9 V for K+/K.

a. Arrange the oxidising agents in order of increasing strength.

b. Which of these oxidising agents will oxidize Cu under standard state conditions?

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