complex-formation titration

Complex-formation titration is a type of chemical analysis where a known amount of a titrant is added to a sample to determine the quantity of a specific substance. In complex-formation titrations, the titrant is a complexing agent, most commonly disodium ethylenediaminetetraacetate (EDTA).12

This method is particularly useful for determining the concentration of metal ions in a solution. The process involves adding the titrant from a burette until the equivalence point is reached, meaning an exact equivalent of titrant has reacted with the substance in the sample. An indicator, which is a dye that forms a colored complex with the metal ion, is used to signal the end point of the titration. At the end point, the titrant reacts with the metal-indicator complex, causing a visible color change.1