When a clean iron nail is placed in an aqueous solution of

copper(II) sulfate, the nail becomes coated with a brownish-black

material.

(a) What is the material coating the iron?

(b) What are the oxidizing and reducing agents?

(c) Can this reaction be made into a voltaic cell?

(d) Write the balanced equation for the reaction.

(e) Calculate E°

cell for the process.