You are trying galvanize a steel pipe... essentially plate zinc onto a pipe. If

Question

You are trying galvanize a steel pipe... essentially plate zinc onto a pipe. If you have steel pipe in a solution of zinc chloride and pass a current of 2.5 A for 3.0 hours, how many grams of Zinc will you plate onto the pipe? If you have a voltaic cell made up of one half-cell with a silver electrode and a 0.025 M silver chloride solution and one half-cell with a cadmium electrode and a 0.52 M Cd(NO_3)_2 solution, what will be the actual cell potential? (To be sure of getting the exact answer, use the reduction potentials from the back of the textbook, not the internet.)

Explanation / Answer

4. faradays first law

w = zit

= (32.69/96500)*2.5*3*60*60

= 9.14 grams

5. 2Ag^+(aq) + Cd(s) ----> Cd^2+(aq) + 2Ag(s)

E0cell = Ec - Ea

           = 0.8 - (-0.4) = 1.2 v

Ecell = E0cell - 0.0591/nlog(Cd^2+)/(Ag+)^2

       = 1.2-(0.0591/2)log(0.52/0.025^2)

      = 1.113 v

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