What is the principle of fajans method?

In the Fajans method, named after Kazimierz Fajans, typically dichlorofluorescein is used as an indicator; the end-point is marked by the green suspension turning pink. Prior to the end-point of the titration, chloride ions remain in excess. They adsorb on the AgCl surface, imparting a negative charge to the particles.

How does fajans method work in precipitation titration?

Fajan’s method This method uses the reaction between the precipitate formed and indicator. The indicator used is dichlorofluorescein which acts as an anion in solution. In chloride solution, due to excess of chloride ions, they form the primary layer of the precipitate.

What is the other name of fajans method?

Thus, the name Mohr’s method was given to this method. The method involves direct titration. Silver nitrate is used to prepare titrants and chloride ion solution is used as an analyte in this procedure. As an indicator, potassium chromate is utilized….Follow Pharmaguideline.

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Which dye used in fajans method?

Acidic dyes used in Fajan’s method is dichlorofluorescein. In Fajan’s method the indicator dichlorofluorescein is used; the end-point is marked by the green suspension turning pink.

Is fajans method direct titration?

It is an indirect method of precipitation. This method was given by American chemist Kazimierz Fajan. That’s why it is known as fajan’s method. This method is also known as the indicator adsorption method because in this method chloride ions present in excess are adsorbed on silver chloride surface.

What is the difference between Mohr and fajans method?

Mohr method is the reaction between silver ion and halide ion in the presence of chromate indicator, while Volhard method refers to the reaction between excess silver ions and halide ions. Fajans method, on the other hand, refers to the adsorption reaction between silver halide and fluorescein.

Is Fajans method direct titration?

What is the difference between Mohr and Fajans method?

Which compound are used as indicator in Faizan method?

Fluorescein is used as an indicator in Fajan’s method. Fajan’s method is named after scientist Fajan. In this method, dichlorofluorescein is generally used as an indicator. The endpoint of the titration is marked by the change in the colour of the suspension from green to pink.

What is Faizan method?

This method was given by American chemist Kazimierz Fajan. That’s why it is known as fajan’s method. This method is also known as the indicator adsorption method because in this method chloride ions present in excess are adsorbed on silver chloride surface. In this method dichlorofluorescein is used as an indicator.

How Fajans method is different from mohrs and Volhard method?