What is Edta: Definition and 19 Discussions

Ethylenediaminetetraacetic acid (EDTA) is an aminopolycarboxylic acid with the formula [CH2N(CH2CO2H)2]2. This white, water-soluble solid is widely used to bind to iron and calcium ions. It binds these ions as a hexadentate ("six-toothed") chelating agent. EDTA is produced as several salts, notably disodium EDTA, sodium calcium edetate, and tetrasodium EDTA.

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  1. Wrichik Basu

    IUPAC Name of EDTA: 2,2′,2″,2′″-(ethane-1,2-diyldinitrilo-)κ^2N

    As per IUPAC Nomenclature of Inorganic Chemistry, the correct name of the edta chelate is $$\text{2,2′,2″,2′″-(ethane-1,2-diyldinitrilo-} κ^2 \text{N)tetraacetato-}κ^4O $$ As far as I know, edta coordinates through Nitrogen and Oxygen atoms, and there is no metal-carbon bond. On the other hand...
  2. B

    Preparation of murexide indicator for Ca measurement

    I want to prepare murexide indicator for Ca measurement using EDTA titrimetric method. I am following the procedure set by the American Public Health Association (APHA), however, I only have murexide diluted with K2SO4 (1:250). I want to know if I can use this as a substitute, and if yes, how...
  3. B

    Determination of Ca/Mg in orthophosphate-rich solutions

    I want to measure the Ca and Mg concentration in a solution that contains up to 250 mg/L of PO43-. Apparently, orthophosphates interfere with both flame photometric methods and complexometric methods with EDTA (or so I've read). Is there a standard method for measuring Ca and Mg in this type of...
  4. B

    Magnesium salt of EDTA is the same as EDTA-2NaMg?

    I was reading through the standard complexiometric method of determining hardness in water, and the procedure mentioned the use of the magnesium salt of EDTA. I looked up online to purchase this reagent but all I could find was disodium magnesium salt of EDTA. Are they one and the same? Thanks!
  5. ReidMerrill

    EDTA Titration of an antacid tablet

    In my analytical chemistry lab course my lab partner and I are trying to determine the percent calcium by mass of an antacid tablet by EDTA (mixed with 0.001M MgCl2) titration using an EBT inidcator. We have ran into a problem which is we've got poor results which we refuse to accept. Long story...
  6. TheSodesa

    Precipitation of lead hydroxide in the presence of EDTA

    Homework Statement 1. The question EthyleneDiamineTetra-acetate(##EDTA^{4-}##) is used in chemical analysis as a complex-former. ##EDTA^{4-}## is also used to treat heavy metal poisoning, as it forms water soluble complexes with them which can then be easily removed by the body. The reaction...
  7. G

    Standard enthelpy of formation needed for EDTA metal complexes

    Hi, I am trying to solve the chemical equilibria in a kraft mill bleach plant to predict mineral scale deposits. I am using the van't Hoff equation to account for temperature dependence of the formation constants, but I need the enthalpy of reaction for all equilibria and I am missing some...
  8. A

    Chem EDTA and Molarity Question. Need help

    [b]1. We had a titration lab where we titrated tap water with EDTA. Through our results we should be able to figure out the molarity of Ca and Mg ions. I think I'm doing this right but it seems to easy in comparison with everything else we are doing in lab and lecture so I just want to know if...
  9. A

    How Do You Calculate the Percentage of Zinc in a Sample Using EDTA Titration?

    Homework Statement I'm trying to determine the percentage of zinc in an unknown sample. What I did in this lab, was, I titrated the zinc solution (which contained about 4g unknown zinc sample) with Na2EDTA and it took about 20 mL to reach the end point. Before doing this, I standardized the...
  10. K

    EDTA Complexometric Titration failed why?

    In my attempt at standardizing an EDTA solution, the blank solution titration was successful, but the standardization titration failed... here's the procedure of my experiment with some details: We first prepared a titration blank by using 35mL distilled water, 5mL of pH10 buffer, 5 drops of...
  11. M

    Concentration of Ca 2+ and Mg 2+ from EDTA titration?

    Homework Statement This is the lab I did: http://chemistry.depaul.edu/wwolbach/205_207/11.pdf only steps 1,2, & 3 was performed Homework Equations MV1=MV2The Attempt at a Solution I need help finding the concentration of Ca 2+ and Mg 2+. I already know the basics of it, but I really don't...
  12. K

    Calcium Concentration in Milk: EDTA Titration Problem and Buffering Explained"

    Homework Statement A sample of powdered milk weighing 1.450 g was mixed with an aqueous buffer of pH 11.5. A few drops of Calagmite indicator were added and the solution required 31.62 mL of 1.539x10^-2 M EDTA to reach the end-point color change. a. Calculate the concentration of calcium...
  13. A

    EDTA Lab Question/Clarification

    I weighed out 0.2416 g disodium EDTA and diluted it with about 250 mL of H2O and stuck it in a plastic bottle to use for titration. My question is, to determine the molarity of my stock EDTA standard sol'n, is it just (0.2416g / 292.25 g) / 0.250 L = 0.00331 M? Or do I have to use the VOLUME of...
  14. S

    EDTA Titration calculation overlook needed

    Homework Statement 25.00 Ml sample of a solution of Al_2(SO4)3 and NiSO4 was diluted to 500.0 mL and the Al^3+ and Ni^2+ in a 25.00 mL aliquat were complexed by addition of 40.00 mL of 0.01175 M EDTA in a pH 4.8 buffer. The excess EDTA was then back titrated with 10.07 mL of 0.00993 M...
  15. S

    How Do You Calculate Water Hardness and Molarity in EDTA Titration?

    EDTA titration?!URGENT NEED HELP we did a lab in school to determine water hardness by EDTA titration. I did three trials , first one require 38mL , 2nd - 50 and third-42 the question was to averge the volumes of EDTA used in the last two titrations and to calculate the moles of EDTA required...
  16. H

    Calculating Ca2+ Weight Percentage Using EDTA Titration Method | Lab Help

    My question is: Using the average [EDTA], find the weight% of Ca2+ in the unknown My attempt: so, the[EDTA] i found from standardizing was 0.005 M; I used 29.85mL to of EDTA to titrate my 25.00mL unknown and the weight of my unknown used was 0.2505 g this is what i did: [EDTA] =...
  17. L

    Calculating EDTA Titration Volume for CoSO4 Solution

    Homework Statement A solution contains 1.694mg of CoSO4 (155.0 g/mol) per mL. Calculate the volume of 0.08640 M EDTA needed to titrate a 25 mL aliquot of this solution. Homework Equations Not really sure, the book is no help but this may help: K(CoSO4) = [CoSO4] / ([CO2+] [SO42-])...
  18. S

    Determining EDTA Concentration in PPM in Aquaous Solution

    how can i determine the concentration of EDTA in PPM in an aquaous solution ? thanks
  19. T

    EDTA titration-(Analytical Chem.)

    EDTA titration--(Analytical Chem.) A mixture of Mn2+, Mg2+, and Zn2+ was analyzed as follows: The 25.00mL sample was treated with 0.25g of NH3OHCl (hydroxylammonium chloride)--a reducing agent that maintains manganese in the 2+ state. 10 mL of ammonia buffer (pH10) and a few drops of...
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