What is the basic principle of complexometric titration?
Complexometric titration is a form of volumetric titration in which the formation of a colored complex is used to indicate the end point 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.
Why is EDTA mostly used in complexometric?
Answer and Explanation: EDTA or Ethylenediaminetetraacetic acid is commonly used as an indicator for complexometric titration because it can act as a ligand which can bind to… See full answer below.
What is EDTA titration used for?
EDTA titration has been traditionally used in quantitating calcium ions in water, in a process referred to as determining water hardness. Water hardness is customarily referred to as concentration of calcium in the form of calcium carbonate.
What are the advantages of complexometric titration?
Complexometric titrations are particularly useful for the determination of a mixture of different metal ions in solution. An indicator capable of producing an unambiguous color change is usually used to detect the end-point of the titration.
What are the advantages of using EDTA as complexing agent?
EDTA is a versatile chelating agent. It can form four or six bonds with a metal ion, and it forms chelates with both transition-metal ions and main-group ions. EDTA is frequently used in soaps and detergents, because it forms a complexes with calcium and magnesium ions.
Why EDTA is stable than EBT?
Answer. EDTA is insoluble in water at low pH because H4Y is predominant in that pH (less than 2). With increasing the pH, each hydrogen ion in the carboxyl groups of EDTA will start to dissociate. Above pH 10, Y4- is predominant.
Why complexometric titrations are pH dependent?
The strength and stability of EDTA complexes depends mainly on the pH. The number of electron pairs actually available to form coordination bonds depends on the dissociation levels of the acid groups and therefore the pH.
What is the advantage of using EDTA as the complexing agent in the titration of copper?
The main reason that 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.
What is principle of EDTA method describe the estimation of hardness of water by EDTA method?
EDTA is Ethylene diamine tetra acetic acid. It dissolves in water with great difficulty, but its disodium salt dissolve in water quickly & completely It is hexa dentate ligend. It binds the metal ions in water to give stable chelate complex. Hence it is called as complexometric titration method.
What are the advantages of complexometric titrations?
Advantages of Complexometric Titrations Complexometric titrations are fast and accurate. For almost all the metal ions the coordination number is either 4 or 6. With monodentate ligands multi step reactions are required.
Can complexometric titrations of metal ions be performed with EDTA?
This presentation involves the complexometric titrations of metal ions solutions specifically with EDTA.
Is EDTA a verstile complexometric agent?
Ethylene diamine tetra acetic acid (EDTA) and its disodium salts are verstile complexometric agents. EDTA form complexes with all metal ions. The complexes formed by using EDTA are of chelate type. Alkali medium is required for complex ion becoz EDTA will ionizes more in alkali medium.
What is the function of indicator in complexometric titration?
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 indicator to form a more stable complex with metal and when the reaction is completed the change for the color is observed.
What is the origin of Endpoint Detection in complexometric titration?
The endpoint detection in complexometric titration was revolutionized by Schwarzenbach in the 1940s with the discovery of visual color indicators sensitive to the concentration of metal ions in solution.