Precipitation titrations are a type of volumetric analysis in which a titrant is added to a solution containing an analyte to form a sparingly soluble precipitate.
The endpoint of the titration is reached when the analyte has completely reacted with the titrant, and no further precipitation occurs.
Precipitation titrations are often used to determine the concentration of a specific ion in a solution.
They are particularly useful when the solubility of the precipitate formed is low and the reaction between the titrant and the analyte is selective.
Argentometric titrations
Argentometric titrations are a class of precipitation titrations that use silver ions (Ag+) as the titrant.
These titrations are primarily employed for the determination of halide ions (chloride, bromide, and iodide) and other anions, such as thiocyanate, in a solution.
Silver nitrate (AgNO3) is the most commonly used titrant in argentometric titrations.
There are several types of argentometric titrations, based on the choice of indicator and the method of detecting the endpoint:
Mohr's method
Volhard's method
Modified Volhard's method (Direct Volhard's method)
Fajans method (Adsorption indicator method)
This arrangement provides a clear, logical flow from general information on precipitation titrations to the specifics of argentometric titrations and their various types.