Using complex-forming processes, complex metric titrations are primarily used to identify metal ions.
Although there are various complexing agents that can be utilized for this task (cyanide, thiocyanate, fluoride, 1,2-diaminoethane, etc.), in actuality the titrants are usually invariably compounds with the iminodiacetic acid functional groups. The sodium salt, Na₂H₂Y 2H₂O, and ethylenediaminetetraacetic acid are the two that are used the most frequently (better soluble in water).
Most requirements for a good complexometric titrant are mostly met by EDTA. It reacts quickly with most metal ions (except Cr₃⁺), forms sufficiently stable complexes with most metal ions, all of the complexes have perfect 1:1 stoichiometry (independent of the charge of the cation), are water soluble, and are colorless (unless the metal is present).
(unless the metal ion is colored by itself). A typical metal ion's reaction with EDTA (H₄Y) can be expressed as follows:
that is, as a battle between the metal ion and hydrogen ions for interacting with Y₂−. The equilibrium constant for the reaction, KMeY, which measures the stability of binding of Men + with Y₂ is as follows.
To know more about complex metric titrations, please refer:
https://brainly.com/question/17784644
#SPJ4
