Chemistry

posted by .

A voltaic cell utilizes the following reaction:
2Fe3+(aq)+H2(g)→2Fe2+(aq)+2H+(aq).

What is the emf for this cell when [Fe3+]= 3.70M , PH2= 0.95atm , [Fe2+]= 7.0×10−4M , and the pH in both compartments is 4.05?

Express your answer using two significant figures.

(emf of this cell under standard conditions is 0.771 V)

E=_____V

  • Chemistry -

    2Fe3+(aq)+H2(g)→2Fe2+(aq)+2H+(aq).

    Ecell = Eocell - (0.5916/2*log Q
    and I know that confuses you but don't be. Plug in the numbers Eo and n and for Q plug in concns/pressures(in atm) as follows:
    Q = [(H^)^2*(Fe^2+)^2]/[(Fe^3+)^2*pH2]

    I write it this way because I'm limited with spacing so I shorten that by using Q, then defining what Q is. Just plug in for Q, evaluate log Q, the multiply by -(0.05916/n) and add algebraically Eocell.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry. please help!!!

    A voltaic cell is constructed based on the following reaction and initial concentrations: Fe2+ (0.0050M) + Ag+ (2.2M) -> Fe3+ (0.0050M) + Ag(s) calculate [Fe2+] when the cell reaction reaches equilbrium i'm so confused. please help. …
  2. AP CHEMISTRY

    A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e− -> Cu(s) I2(s) + 2 e− -> 2 I−(aq) The cell is operated at 298 K with [Cu+ ] = 2.7 M and [I− ] = 2.7 M. (a) Determine …
  3. AP CHEMISTRY

    A voltaic cell is constructed that is based on the following reaction. Sn2+(aq) + Pb(s) -> Sn(s) + Pb2+(aq) (a) If the concentration of Sn2+ in the cathode half-cell is 1.80 M and the cell generates an emf of +0.219 V, what is the …
  4. AP CHEMISTRY

    A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e− -> Cu(s) I2(s) + 2 e− -> 2 I−(aq) The cell is operated at 298 K with [Cu+ ] = 2.7 M and [I− ] = 2.7 M. (a) Determine …
  5. Chemistry

    A voltaic cell utilizes the following reaction and operates at 298K 3Ce{4+}(aq)+Cr(s)--->3Ce{3+}(aq)+Cr{3+}(aq) {}=Charge What is the EMF of this cell under standard conditions?
  6. Chemistry

    A voltaic cell utilizes the following reaction and operates at 298K 3Ce{4+}(aq)+Cr(s)--->3Ce{3+}(aq)+Cr{3+}(aq) {}=Charge What is the EMF of this cell under standard conditions?
  7. chemistry

    balance the net ionic equation for the overall reaction. Pt | Fe2+(aq), Fe3+(aq) || I-(aq) | AgI(s) | Ag(s) a) Fe3+(aq) + Ag(s) + I-(aq) → Fe2+(aq) + AgI(s) b) Fe2+(aq) + Ag(s) + I-(aq) → Fe3+(aq) + AgI(s) c) Fe3+(aq) + …
  8. Chemistry

    Given the following half-reactions and associated standard reduction potentials: AuBr−4(aq)+3e−→Au(s)+4Br−(aq) E∘red=−0.858V Eu3+(aq)+e−→Eu2+(aq) E∘red=−0.43V IO−(aq)+H2O(l)+2e−→I−(aq)+2OH−(aq) …
  9. Chemistry

    The following galvanic cell at standard conditions has a potential of 0.03 V: Ag+(aq) + Fe2+(aq) → Fe3+(aq) + Ag(s). What would be the effect of increasing the concentration of Ag+?
  10. Chemistry

    The following galvanic cell at standard conditions has a potential of 0.03 V: Ag+(aq) + Fe2+(aq) → Fe3+(aq) + Ag(s). What would be the effect of increasing the concentration of Ag+?

More Similar Questions