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

  • Thread starter zeshkani
  • Start date
In summary, using titration, the composition and brand name of an unknown alloy was determined. The alloy contained Fe, Al, Ni, Co, and Cu and was dissolved and diluted to 1 liter with oxygen bubbled through it to oxidize each metal to its highest oxidation state. The titrations were done with an EDTA solution of 0.0230M, with the first equivalence points at 17.0 mL for Titration A, 38.2 mL for Titration B, 11.11 mL for Titration C, and 13.85 mL for Titration D. In Titration A, the pH was adjusted to 0.0 and an appropriate ISE was used. In Titration
  • #1
zeshkani
29
0
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.
 
Physics news on Phys.org
  • #2
well do you know what you use titration for? Like what do you find when you use titration on an uknown substance?
 
  • #3
In titration D, murexide complexes with nickel and shifts its potential negative of cobalt.

(b) In titration A, the first equivalence point at 17.0 mL indicates the presence of Fe(II) in the alloy. In titration B, the first equivalence point at 38.2 mL indicates the presence of Al(III) in the alloy. In titration C, the titration requires 11.11 mL, indicating the presence of Cu(II) in the alloy. In titration D, the titration requires 13.85 mL, indicating the presence of Ni(II) in the alloy.

Using this information, the experimentally determined composition of the alloy is 1 part Fe, 1 part Al, 1 part Cu, and 1 part Ni. The brand name of the alloy cannot be determined from this information alone and would require further analysis and comparison with known alloys.
 

What is the purpose of analyzing metals with titrations?

The purpose of analyzing metals with titrations is to determine the concentration of specific metals in a sample. This is done by adding a known volume of a solution with a known concentration (titrant) to the sample until a chemical reaction occurs, resulting in a color change. The volume of titrant needed to reach the endpoint can then be used to calculate the concentration of the metal in the sample.

What is the process for analyzing metals with titrations?

The process for analyzing metals with titrations involves first preparing the sample by dissolving it in a suitable solvent. Then, a known volume of the sample is transferred to a titration flask and a suitable indicator is added. The titrant is then added gradually while swirling the flask until the desired endpoint is reached. The volume of titrant used is recorded and can be used to calculate the concentration of the metal in the sample.

How can titrations be used to analyze Fe, Al, Ni, Co, and Cu in an unknown alloy?

Titrations can be used to analyze Fe, Al, Ni, Co, and Cu in an unknown alloy by first preparing the sample as described before. Then, separate titrations can be performed for each metal by using a specific titrant and indicator that will react only with that metal. By recording the volumes of titrant used for each titration, the concentrations of each metal in the alloy can be calculated.

What are some factors that can affect the accuracy of titrations when analyzing metals?

Some factors that can affect the accuracy of titrations when analyzing metals include the purity of the sample, the accuracy of the equipment used, and the presence of other metals or substances that can interfere with the titration reaction. It is important to properly prepare the sample and carefully perform the titration in order to obtain accurate results.

What are the advantages of using titrations for metal analysis compared to other methods?

There are several advantages of using titrations for metal analysis compared to other methods. Titrations are relatively simple and inexpensive to perform, and they can provide accurate results when performed correctly. They also allow for the analysis of multiple metals in a single sample, making them a versatile method for metal analysis. Additionally, titrations do not require specialized equipment and can be performed in a variety of settings, making them accessible for many researchers and scientists.

Similar threads

Chemically regenerating my auto's catalytic converter?
    • Chemistry
Replies
16
Views
2K

Hot Threads

Recent Insights

Back
Top