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Need help with A-Chem

  1. Nov 13, 2007 #1
    1.0000 grams of an unknown alloy is dissolved and diluted to 1 liter. Oxygen is bubbled through the solution
    to oxidize each of the metals to their highest oxidation state. The sample is known to contain only Fe, Al, Ni,
    Co, and Cu. 100.00 mL aliquots are taken for each of the following titrations. The concentration of the EDTA
    solution is 0.0230M.

    Titration A: The pH is adjusted to 0.0, and the titration is followed with an appropriate ISE. The volume at the
    rst equivalence point is 17.0 mL.

    Titration B: The pH is adjusted to 1.8 and the solution is ltered. The remaining solution is titrated and
    monitored with an appropriate ISE. The volume at the rst equivalence point is 38.2 mL.

    Titration C: The pH is adjusted to 5.7 and the solution is ltered. To the remaining solution, 0.01 moles of
    2,3-dimercaptopropanol and murexide are added. The solution is titrated to red violet. The titration requires
    11.11 mL.

    Titration D: The pH is adjusted to 5.7 and the solution is ltered. To the remaining solution, murexide is added.
    The solution is titrated to red violet with 13.85 mL.

    (a) What is determined in each titration step?
    (b) What is the experimentally determined composition and brand name of the alloy?

    like fpr question A, what is it even asking, it seems to complicated

    and also A: The EDTA and murexide are not relevant to this problem. Let the concentration of the titrant be 0.0230 M in each part. Let the titrant in titrations A and B be Ti(II). Let the titrant be In(I) in titrations C and D. In titration C, the 2,3-dimercaptopropanol complexes Cu(II) and shifts its potential negative of nickel.
     
  2. jcsd
  3. Nov 13, 2007 #2
    well do you know what you use titration for? Like what do you find when you use titration on an uknown substance?
     
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