Which Indicator Is Used In Mohr’s Method?

Mohr's method is a technique used in analytical chemistry to determine the concentration of a substance in a solution by titration. In Mohr's method, the indicator used is typically a silver nitrate solution and a chromate ion (usually potassium chromate) indicator. The indicator changes color when the equivalence point is reached during the titration, indicating the completion of the reaction between the analyte and the titrant.

The silver nitrate solution is added to the analyte solution until the endpoint is reached, which is signaled by the formation of a reddish-brown precipitate of silver chromate. The appearance of the reddish-brown color indicates that all the chloride ions in the analyte have reacted with the silver ions from the silver nitrate solution, forming the silver chromate precipitate.

At the endpoint, the appearance of the reddish-brown precipitate indicates that the stoichiometric amount of silver ions has reacted with all the chloride ions present in the sample, allowing the concentration of the chloride ions to be determined based on the volume of silver nitrate solution required for the titration.

It's worth noting that there are other methods and indicators used for different types of titrations, and the choice of indicator depends on the specific reaction being studied and the substances involved in the titration.