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What Are the Advantages of Using Edta in the Complexometric Titrations?

FAQs william September 20, 2022

The most common indicators in complexometric titrations are organic dyes, which function by forming a colored complex with the metal ion being titrated. During the reaction EDTA replaces the tracer to form a more stable complex with metal and when the reaction is complete the change in color is observed.

What are the advantages of EDTA in complexometric titration?

EDTA or ethylenediaminetetraacetic acid is commonly used as an indicator for complexometric titration because it can act as a ligand that can bind to coordination centers that are usually metals to form colored complexes.

What are the advantages of using EDTA?

The main benefit of EDTA is that it does not distort blood cells, making it ideal for most hematology tests. It is known to cause erroneous platelet count results from automated hematology analyzers giving low platelet counts.

What are the advantages of complexometric titration?

Advantages of complexometric titrations

Complexometric titrations are fast and accurate. For almost all metal ions, the coordination number is either 4 or 6.

Why is EDTA mostly used in complexometric?

The main reason EDTA is used so extensively in the standardization of metal cation solutions is that the formation constant for most metal cation-EDTA complexes is very high, meaning that the equilibrium for the reaction: M2+ + H4Y → MH2Y + 2H. is far to the right.

What is EDTA and why EDTA is preferable ligand in complexometric titration?

EDTA, also known as ethylenediaminetetraacetic acid, is a complexometric indicator composed of 2 amino groups and four carboxyl groups called Lewis bases. Edta is a hexadentate ligand due to its ability to denote six pairs of lone electrons due to the formation of covalent bonds.

What is the principle of complexometric titration with EDTA?

Eriochrome Black T loosely binds to metal ions, while EDTA binds strongly to metal ions. So when all the metal ions are bound to EDTA, the indicator EBT remains free in the sample and the solution turns blue.

What are the advantages of titration?

Titrimetric analysis, commonly referred to as volumetric analysis, offers distinct advantages over cumbersome gravimetric methods: Speed ​​of analysis. Immediate completion of reactions. Greater accuracy by minimizing material loss during decanting, filtering, precipitating, or similar operations.

What are the advantages and disadvantages of titrations?

Titrimetric analysis, commonly referred to as volumetric analysis, offers distinct advantages over cumbersome gravimetric methods: Speed ​​of analysis. Immediate completion of reactions. Greater accuracy by minimizing material loss during decanting, filtering, precipitating, or similar operations.

What are the disadvantages of complexometric titration?

It is a destructive method because relatively large amounts of the substance to be analyzed are used. This can result in chemical waste that must then be disposed of. It has limited accuracy. There is a possibility of human error with this method.

What are EDTA titrations?

EDTA titrations are complexometric titrations. Complexometric titration (sometimes called chelatometry) is a form of volumetric analysis that uses the formation of a colored complex to indicate the endpoint of a titration.

Which among the indicators can be used in the complexometric titration using EDTA?

To perform metal cation titrations with EDTA, it is almost always necessary to use a complexometric indicator to determine when the endpoint has been reached. Common indicators are organic dyes such as Fast Sulphon Black, Eriochrome Black T, Eriochrome Red B, Patton Reeder or Murexide.

How does EDTA help determine metal ions in water?

When the EDTA titrant is added to a hard water sample, free Mg2+ and Ca2+ ions are initially trapped. After all free ions have been complexed, EDTA reacts with the small amount of bound metal ion indicator complex. The metal ions are effectively removed from the indicator because EDTA binds to these ions more firmly.

Why disodium salt of EDTA is used in complexometric titration?

1 answer. The disodium salt of EDTA is preferred in hardness estimation primarily because it is more soluble in aqueous solutions, allowing the release of the EDTA ligand into the solution for reaction.

Why EDTA is more stable than EBT?

Answers. EDTA is insoluble in water at low pH as H4Y predominates at this pH (less than 2). As the pH increases, any hydrogen ions in the carboxyl groups of EDTA begin to dissociate. Above pH 10, Y4- is predominant.

What are the limitations of the EDTA titration in determining metal ion concentrations?

Lack of Selectivity: Because EDTA forms stable complexes with most metal ions, it lacks selectivity when used to determine a single metal cation from a solution or mixture of metal ions.

What factors influence EDTA titration?

FACTORS INFLUENCES TITRATION VALUES

Nature of the metal ion: With increasing acidity of the metal ion, the stability of the complex also increases. Ion size: The smallest ion forms the stable complex. Ionic charge: The higher the charge, the more stable the complex.

What is the basic principle of complexometric titration?

Complexometric titration is a form of volumetric titration that uses the formation of a colored complex to indicate the endpoint of a titration. The complexes are formed by the reaction of a metal ion (an acceptor, a central atom or a cation) with an anion, a neutral molecule or very rarely a positive ion.

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