Analyzing Metals with Titrations: Fe, Al, Ni, Co, and Cu in Unknown Alloy

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SUMMARY

This discussion focuses on the analysis of an unknown alloy containing iron (Fe), aluminum (Al), nickel (Ni), cobalt (Co), and copper (Cu) using titrations with EDTA and murexide. Four titrations were performed at varying pH levels: Titration A at pH 0.0, Titration B at pH 1.8, Titration C at pH 5.7 with 2,3-dimercaptopropanol, and Titration D at pH 5.7 with murexide. The concentrations of the titrant were consistently 0.0230 M, with specific volumes recorded at the first equivalence points: 17.0 mL for A, 38.2 mL for B, 11.11 mL for C, and 13.85 mL for D. The discussion also clarifies the roles of the titrants used in each titration step.

PREREQUISITES
  • Understanding of titration techniques and their applications in analytical chemistry.
  • Knowledge of pH adjustment and its significance in metal ion analysis.
  • Familiarity with ion-selective electrodes (ISE) for monitoring titration endpoints.
  • Basic concepts of complexation reactions involving EDTA and murexide.
NEXT STEPS
  • Research the principles of complexometric titration using EDTA for metal ion analysis.
  • Study the role of ion-selective electrodes (ISE) in determining equivalence points in titrations.
  • Learn about the chemical properties and applications of 2,3-dimercaptopropanol in metal ion complexation.
  • Explore the significance of pH in titration reactions and its effect on metal ion solubility and complexation.
USEFUL FOR

Chemists, laboratory technicians, and students in analytical chemistry who are involved in metal analysis and titration methodologies.

zeshkani
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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.
 
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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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