Which is NOT true about EDTA? a. EDTA acts as a complexing agent in compleximetric titrations b. EDTA acts as a lewic acid in formation of complexes c. EDTA forms a 1:1, stable, water-soluble complex d. EDTA has high formation constants with metals.
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Which is NOT true about EDTA? a. EDTA acts as a complexing agent in compleximetric titrations b. EDTA acts as a lewic acid in formation of complexes c. EDTA forms a 1:1, stable, water-soluble complex d. EDTA has high formation constants with metals.
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- b. EDTA cannot be used as a primary standard always. When can EDTA be used as a primarystandard ? Give reason why EDTA is used in complexometric titrations.Elaborate the reason why EDTA is used in many complexometric titrations. How will you be able to improve its selectivity when it comes to analyzing specific metals?Select all statements that state the purpose of an auxiliary complexing agent and example of its use. a) A completing agent forms a weak complex with analyte ion, thereby keeping it in solution without interfering with EDTA titration. b) NH3 keeps Zn2+ in solution at high pH, but is easily displaced by EDTA. c) A completing agent forms a strong complex with analyte ion, thereby keeping it in solution without interfering with EDTA titration. d) NH3 keeps Zn2+ in solution at high pH, but is not displaced by EDTA.
- 1. an accurately weighed chelometric standard calcium carbonate of 150 mg was used to standardize Disodium ethylenediaminetetraacetate, using the same procedure set by the monograph. The total volume of EDTA consumed was 37.5 ml . Calculate the molarity and normality of the standard solution. 2. A 0.62L of 0.072N silver nitrate was used to titrate three samples of sodium lauryl sulfate with 2500 mg,5000mg, and 6750 mg respectively. Tabulate its data, calculate the %NaCl in each sample , did any sample conformed to the official requirement?A 25 ml solution of unkown containing Fe+3 and Ca+2 required 16.06 ml of 0.051 M EDTA for complete the reaction. A 50 ml of the same of the unkown was treated with NH4F to protect Fe+3. then the Ca+2 was reduced and masked by addition thiourea. upon addition of 25 ml of 0.051 M EDTA, the Fe+3 was liberated fron its floride complex and formed EDTA complex . the excess ETDA required 19.77 ml of 0.01883 M pb+2 to reach the end point by using xylenol orange indicator. Find the concentarion of Ca+2 in the unkown sample?Which of the following causes the sharpest change in the equivalence point of a complexometric titration? A. Increasing the concentration of the EDTA solution B. Decreased concentration of the analyte C. Increasing the concentration of the EDTA solution D. Increasing the stability of the [metal-EDTA] complex
- A small amount of Mg-EDTA is often added in the titrimetric determination of water hardness. Why? A. Mg forms the most stable EDTA complex of all multivalent cations. B. It ensures that enough Mg ions are present for satisfactory indicator action. C. Mg-EDTA is inert and therefore does not influence the results, but it enhances indicator action.D. The Mg-EDTA dissociates after all the other cations have been titrated and therefore ensures that the end point is clearly visible.A 25.00-mL sample containing Fe3+ was treated with 10.00 mL of 0.036 7 M EDTA to complex all the Fe3+ and leave excess EDTA in solution. The excess EDTA was then back titrated, requiring 2.37 mL of 0.0461 M Mg2+. What was the concentration of Fe3+ in the original solution?Write the mass balance equation for EDTA and the complete charge balance for the complexometric titration of Zn2+ with EDTA.
- You took 25.00 mL of unknown water solution and titrated it with EDTA. The EDTA solution molarity was 0.01 M, and it took 16.50 mL to reach the end point. With the blank it took only 0.98 mL to reach end point. A) How many milliliters of EDTA solution were used to titrate hardness that actually came from the unknown? B) How many moles of EDTA reacted with hardness-causing ions from the unknown sample? C) How many moles of hardness-causing ions were present in the unknown sample? D) Assuming that the total hardness of water is due to CaCO3, how many grams CaCO3 does it correspond to? E) What is the total hardness of the unknown water in ppm CaCO3?a. What is the structure and full name for EDTA? b. The titration of Zn^+2 and EDTA is carried out in the same manner as the Mg^+2 * EDTA titration (in fact, Zn metal may be used to standardize your EDTA solution). In this case, the ammonia from the pH 10 buffer serves an additional purpose. What is it? c. Although EDTA has, in its fully protonated form, 4 hydrogen atoms that can be lost, it is listed as a hexadentate ligand. Explain why this is the case.Complex Ion Formation and Precipitation Reactions i. A 1-L water sample was submitted for determination of chloride ion. 100.00mL the sample was analyzed using the Volhard method. 50.00 mL of 0.0929N AgNO3 was added to the sample and was back titrated with 12.50mL of 0.0510N KSCN solution to reach the end point. Find ppm Cl- in the water sample. ii. Using Mohr method, the chloride content of a mineral water was determined. 50.00mL of the sample was titrated with 10.80mL of 0.05N AgNO3 solution to reach end point. Determine the concentration of Cl- in ppm. iii. Calculate the hardness of a water sample such that 100.00mL of the sample required 35.00mL of 0.1051M EDTA solution to reach the end point.