Post a New Question

Chemistry

posted by .

Tarnish on iron is the compound FeO. A tarnished iron plate is placed in an aluminum pan of boiling water. When enough salt is added so that the solution conducts electricity, the tarnish disappears.

Imagine that the two halves of this redox reaction were separated and connected with a wire and a salt bridge.

Calculate the standard cell potential given the following standard reduction potentials:
Al3++3e−→Al;E∘=−1.66 V
Fe2++2e−→Fe;E∘=−0.440 V

I thought it was 2.1 V but i am wrong...

  • Chemistry -

    The two half reactions are
    2Al ==> 2Al^3+ + 6e Eo = 1.66
    3Fe^2+ + 6e ==> 3Fe Eo = -0.44
    --------------------
    Add half cells to obtain rxn.
    Add Eo to obtain Eocell.

  • Chemistry -

    The reduction potential that is the highest is where reduction is taken place, and reduction takes place at the cathode.

    Fe2++2e−→Fe;E∘=−0.440 V <==Cathode

    Al3++3e−→Al;E∘=−1.66 V <==Anode

    Ecell=Ecat-Ered

    Ecell=−0.440 V-(−1.66 V)

    Ecell=1.22V

  • Chemistry--Typo -

    The initial equation should read Ecell=Ecat-Eano

    cat=cat
    ano=anode

    I just want to add one thing: The way that Dr. Bob222 went about balancing the equation is correct, but one thing to keep in mind is that although you must balance the electrons which requires increasing moles or multiplying compounds by a number to accomplish this, reduction potential are left alone; this is a common mistake that I see done a lot.



    ***The way that I remember which goes, which is with a little rhyme:

    Electrons are negatively charge and are light, and like helium, they like to float from the ground, low potential, to the sky, high potential. Protons are positively charge and are heavy. They like to fall from the sky from the sky, high potential, to the ground, low potential.

    Oxidation loses electrons and reduction gains them.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    Can someone make sure that I am correct with my first solution?
  2. chemistry

    Tarnished silver contains Ag2S. The tarnish can be removed by placing silverware in an aluminum pan containing an inert electrolyte soln, such as NaCL. Explain the electrochemical principle for this procedure, [The standard reduction …
  3. chemistry

    I did an experiment today called "removing tarnish". we removed tarnish from a fork wrapped in foil paper. Now i have to answer some questions. please correct me if i answer them wrong. im not the best in chemistry. thanks. 1. describe …
  4. chemistry

    Exactly 10 mL of water at 25°C was added to a hot iron skillet. All of the water was converted into steam at 100°C. If the mass of the pan was 1.20 kg and the molar heat capacity of iron is 25.19 J/mol∙°C, what was the temperature …
  5. college chemistry

    exactly 11.2 ml of water at 23°c are added to a hot iron skillet. all of the water is converted into steam at 100°c. the mass of the pan is 1.5 kg and the molar heat capacity of iron is 25.19 j/(m·°c). what is the temperature change …
  6. chemistry

    in an experiment, a 4.000grams sample of aluminum metal is added to a solution containing 5.000grams of dissolved iron chloride. the reaction results in the formation of aluminum chloride and metallic iron. when the reaction is complete, …
  7. Chemistry

    a 4.000grams sample of aluminum metal is added to a solution containing 5.000grams of dissolved iron chloride. the reaction results in the formation of aluminum chloride and metallic iron. when the reaction is complete, unreacted aluminum …
  8. chemistry

    a) The combustion of an organic compound in the presence of excess oxygen produced a gas , which makes clear lime water turbid. What element can be identified?
  9. chemistry

    a) The combustion of an organic compound in the presence of excess oxygen produced a gas , which makes clear lime water turbid. What element can be identified?
  10. chemistry

    If your favorite silver jewelry ever tarnishes and you happen to have some aluminum foil on hand, you can actually get rid of some of that tarnish. The tarnish here is actually silver sulfide. If you put the jewelry and aluminum into …

More Similar Questions

Post a New Question