What are the limitations of EDTA titration?
Their main disadvantages are that they have low sensitivity and selectivity. Ethylenediaminetetraacetic acid (EDTA) complexometric titrations are based on the fact that many metallic ions form stable complexes with this tetradentate ligand, EDTA.
What are the limitation of EDTA titration in determining metal ion concentration?
Limitations of EDTA as titrant: 1. Formation of insoluble hydroxides: Many ETDA titrations are carried out under alkaline pH which may lead to formation of insoluble hydroxides or basic salts that may compete with the complexation process . 2.
Is a major drawback of EDTA titrations *?
Lack of selectivity: Since EDTA forms stable complexes with most of the metal ions, it lacks selectivity if it is used to estimate a single metal cations from a solution of mixture of metal ions.
What are the advantages of using EDTA in complexometric titration?
EDTA or Ethylenediaminetetraacetic acid is commonly used as an indicator for complexometric titration because it can act as a ligand which can bind to coordinate centers which are usually metals to form colored complexes.
Why EDTA titration is pH dependent?
The unusual property of EDTA is its ability to chelate or complex metal ions in 1:1 metal-to-EDTA complexes. The fully deprotonated form (all acidic hydrogens removed) of EDTA binds to the metal ion. Many of the reactions are pH dependent, especially the weaker forming complexes with Ca+2 or Mg+2.
What are the factors that affect the titration values in complexometric titration?
Factors affecting the shape of titration curves-concentration, completeness of reaction. Titration of mixtures-feasibility of redox titrations. Detections of end point-redox indicators, theory, specific and non specific indicators, choice of indicator, potentiometric end point detection.
What is the advantage of EDTA titration?
This method uses a very large molecule called EDTA which forms a complex with calcium ions. Therefore, the sample is avoided from interferences and calcium ions can be determined more accurate.
What are the limitations of titration method?
Determining End Point The most common and obvious limitation of titration experiments is that the end point of the process does not necessarily equal the equivalence point precisely.