What is complexometric titration in chemistry?

Complexometric Titration or chelatometry is a type of volumetric analysis wherein the coloured complex is used to determine the endpoint of the titration. Titration is one of the common method used in laboratories which determines the unknown concentration of an analyte that has been identified.

What are the types of complexometric titration?

Types of titration with EDTA Direct titration: the cations are titrated directly with standard solution EDTA using eriochrome black T as the indicator. Back titration: a known excess of standard solution EDTA is added to the solution containing the analyte.

What is principle of EDTA titration?

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.

Why is EDTA used in complexometric titrations?

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 complexometric reaction?

Complexometric titration are those reactions where a simple ion is transformed into a complex ion and the equivalence point is determined by using metal indicators or electrometrically.

What is masking and Demasking?

A masking agent is a reagent used in chemical analysis which reacts with chemical species that may interfere in the analysis. Demasking is the process inwhich the masked substance regains its ability to enter into a particular reaction.

What are the uses of complexometric titration?

Complexometric titration is used for the estimation of the amount of total hardness in water. It is widely used in the pharmaceutical industry to determine the metal concentration in drugs. Titanium dioxide is used in many cosmetic products. This can be analysed by complexometric titration.

What are masking and Demasking agents in complexometric titration?

Masking agents are chemical reagents that are useful in chemical analysis for the removal of impurities from a reaction mixture. Demasking agents are chemical reagents that are useful in introducing the impurities which were masked before the reaction mixture.

Which is example of Demasking agents?

Demasking agent :- & EDTA. EXAMPLE :- The masking by CN– can be removed by mixture of formaldehyde, acetic acid on addition of demasking agent to [Zn (CN)4]2- Zn is liberated and titrated.

What is the difference between masking and Demasking agent?

Masking may be defined as the process in which a substance, withoutphysical separation of it or its reaction products, is so transformed that it does not enter into a particular reaction. Demasking is the process inwhich the masked substance regains its ability to enter into a particular reaction.

What are masking and Demasking?