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 on 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.

answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.