chemistry

From the indicated voltages for the voltaic cell pictured, determine the standard electrode potential, E°M3+/M, if the metal, M, is each of the following.

description on the image:

in the left beaker there is one Cr3+ and one Cr2+ on the right beaker there is 'M'3+
the left one is oxidation the right is reduction.

heres the given:

La, E°cell = -1.96 V

so i have to find the Voltage of La i got -1.54 but it was wrong. don't you just use the equation

-1.96 V= .424V(oxidation potential for the Cr2+... equation) + x

and solve for x??

asked by Hannah
  1. What is La? Lanthanum. One of the various metals to plug into the problem? Do you want La^3+ + e ==> La^2+ or some other?
    Anyway,
    Yes, I think you do that for the equation I think you misplaced a sign.
    Ecell = Eoxdn + Eredn
    =-1.96 = 0.424 + X
    X = -1.96-.424 = -2 something.

    posted by DrBob222

Respond to this Question

First Name

Your Answer

Similar Questions

  1. chemistry

    A voltaic cell that uses the reaction Tl3+(aq) + 2 Cr2+(s) ¨ Tl+(aq) + 2 Cr3+(aq) has a measured standard cell potential of +1.19 V. determine E‹red for the reduction of Tl3+(aq) to Tl+(aq).
  2. AP Chemistry

    This is the question I am having trouble with: A voltaic cell consists of a strip of lead metal in a solution of Pb(NO3)2 in one beaker, and in the other beaker a platinum electrode is immersed in a NaCl solution, with Cl2 gas
  3. Chemistry

    Given these standard reduction potentials at 25 C 1. Cr3+ + e- ===> Cr2+ E1=-0.407 V 2. Cr2+ + 2e- ===> Cr(s) E2=-0.913 V determine the standard reduction potential at 25C for the half-reaction equation Cr3+ + 3e- ===>
  4. chemistry

    For the reaction that occurs in the voltaic cell, Fe(s)|Fe2+(aq)||Cr3+(aq), Cr2+(aq)|Pt(s) determine E°cell. I don't understand how the Pt(s) would be used to solve this question. Please help!
  5. College Chemistry

    For the reaction that occurs in the voltaic cell Fe(s)|Fe2+(aq)||Cr3+(aq),Cr2+(aq)|Pt(s) use data from Appendix D in the textbook to answer the following questions: a)Determine the equation for the cell reaction b)Determine E0
  6. chemistry

    Given these standard reduction potentials at 25oC: Cr3+ + e- -> Cr2+ (E1^o = -0.407V) Cr2+ + 2e- -> Cr(s) (E2^o = -0.913V) Determine the standard reduction potential at 25oC for the half-reaction equation: Cr3+ + 3e- ->
  7. chem

    A voltaic cell consists of a strip of cadmium metal in a solution of Cd(NO3)2 in one beaker, and in the other beaker a platinum electrode is immersed in a NaCl solution, with Cl2 gas bubbled around the electrode. A salt bridge
  8. chemistry

    A voltaic cell is contructed in which a copper wire is placed in a 1.0 M Cu(NO3)2 solution and a strip of gold i placed in a 1.0 M AuNO3 solution. The measured potential of the cell is found to be 1.36V and the copper electrode is
  9. Chemistry

    The standard reduction potential for Cr3+(aq) is −0.74 V. The half-reaction for the reduction of Cr3+(aq) is the following. Cr3+(aq) + 3 e− → Cr(s) The standard reduction potential for Ni2+(aq) is −0.26 V. The
  10. Chemistry again

    Two voltaic cells are to be joined so that one will run the other as an electrolytic cell. In the first cell, one half-cell has Au foil in 1.00M Au(NO3)3, and the other half-cell has a Cr bar in 1.00M Cr(NO3)3. In the second cell,

More Similar Questions