analytical chemistry

posted by .

A solution containing both Fe
3+
and Al
3+
can be selectively analyzed for Fe
3+
by
buffering to a pH of 2 and titrating with EDTA. Th
e pH of the solution is then raised
to 5 and an excess of EDTA added, resulting in the
formation of the Al
3+
- EDTA
complex. The excess EDTA is then back-titrated usi
ng a standard solution of Fe
3+
,
providing an indirect analysis for Al
3+
.
a.
Show that at a pH of 2, the formation of t
he Fe
3+
- EDTA complex is
favorable, while the formation of the Al
3+
- EDTA complex is not.

  • analytical chemistry -

    The percent (% w/w) water in a freeze-dried antibiotic is determined
    in the following manner. A 0.175-g sample is placed in a vial along with 4.489
    g of methanol. Water in the sample extracts into the methanol, which is then
    analyzed. If GC analysis of the methanol yields a peak height of 13.66, what is
    the % w/w water in the antibiotic?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    25.00 mL aliquots of the solution from Part 1 are titrated with EDTA to the Eriochrome Black T end point. A blank containing a small measured amount of Mg2+ requires 2.60 mL of the EDTA to reach the end point. An aliquot to which the …
  2. Chemistry

    A 25.00 ml sample of a standard solution containing 1 g of CaCO3/L required 25.20 ml of EDTA to fully complex the Ca present. Calculate the volume of EDTA stoichiometrically equivalent to 1.0 mg of CaCO3. From the volume of EDTA required …
  3. Chemistry

    The reaction of a metal ion, M^2+, with EDTA is given in the following equation: M^2+(aq) + Y^4-(aq) <==> MY^2-(aq) The EDTA was standardized with a 0.04 M Zn^2+ solution. 25.05 mL of EDTA solution was used to titrate the Zn^2+ …
  4. analytical chemistry

    An EDTA solution is standardized against a solution of primary standard CaCO3 (0.5622 g dissolve in 1000 ml of solution) and titrating aliquots of it with the EDTA. If a 25.00 ml aliquot required 21.88 ml of the EDTA, what is the concentration …
  5. Analytical chemistry

    A 25.0-mL solution of 0.0660 M EDTA was added to a 33.0-mL sample containing an unknown concentration of V3 . All V3 present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a 0.0450 M Ga3 solution …
  6. Chemistry

    The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig …
  7. Science (chemistry) help please

    The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig …
  8. Chem 2

    A 100-mL sample of water is titrated with EDTA solutions in problem 2. The same amount of Mg2+ is added as previously, and the volume of EDTA required is 31.84mL. What volume of EDTA is used in titrating the Ca2+ in hard water?
  9. Chemistry (titrations)

    15.00 mL of 0.01200 M EDTA were used to titrate 50 mL aliquot solution containing iron (II). How much iron (II) is present in the solution?
  10. Chemistry

    You are titrating 50ml of a 0.02M solution of Zn^+2 at pH 7 with 0.05M solution of EDTA. What is the [Zn+2] after 20mL of EDTA has been added?

More Similar Questions