Question 2

(a) With the help of a diagram explain how the electrode potential of a half cell develops (5 marks)

(b) Discuss two conditions under which an electrochemical corrosion cell can form within a single metal (5 marks)

a) One end of a zinc wire is immersed in an electrolyte of 0.07M Zn 2+ ions and the other end is immersed in a solution containing 0.002M Zn 2+ ions, both at 25 oC

(i) Which end of the wire will corrode? Explain (5 marks)

(ii) What do you call this type of electrochemical cell? (5 marks