Electrochemistry Assignment

Objectives A and B

1. What is the difference between an anode and a cathode ?

2. Why are cations attracted to the cathode ?

3. Given:

Au+3 + 3 Fe+2 ---> Au + 3 Fe+3

Fe+3 + Cu ---> Fe+2 + Cu+1

a. Is Cu a stronger reducing agent than Fe+2 ?

b. Is Fe+2 a stronger reducing agent than Au ?

c. What would be favoured, then, in the following equilibrium ?

Au + 3 Cu+1 = 3 Cu + Au+3

d. What is the strongest oxidizing agent in (c) ?

 

4. 3 Cs + Al+3 ---> 3 Cs+1 + Al

Li + Cs+1 ---> Li+1 + Cs

a. Of the above which metal has the strongest tendency to lose electrons?

b. Between Cs and Li, which is the stronger reducing agent?

c. Write an equation to represent the reaction between Li and Al+3.

d. Explain (c) in terms of competition for electrons.

5. a. Draw an electrochemical cell for:

 

Cr + Au+3 ---> Cr+3 + Au

b. Label the anode and cathode.

c. Show the electron flow.

d. Write the half reactions involved.