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Complexometric Titrations
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Complexometric titration (sometimes chelatometry) is a form of volumetric analysis in which the formation of a colored complex is used to indicate the end point of a titration. Complexometric titrations are particularly useful for the determination of a mixture of different metal ions in solution. An indicator capable of producing an unambiguous color change is usually used to detect the end-point of the titration. • In theory, any complexation reaction can be used as a volumetric technique provided that: • 1. the reaction reaches equilibrium rapidly after each portion of titrant is added. • 2. interfering situations do not arise. For instance, the stepwise formation of several different complexes of the metal ion with the titrant, resulting in the presence of more than one complex in solution during the titration process. • 3. a complexometric indicator capable of locating equivalence point with fair accuracy is available. • 4. In practice, the use of EDTA as a titrant is well established. • Contents – • • Terms‐Complex, complexing agents (Complexones), Chelate, Ligand, Dentate and • types, Co‐ordination number, Chelating agent, Sequestering agent, Metal – Ligand • complex. • • Aspects in complex formation with respect to Disodium Edetate‐ Dissociation • constant, pH, Stability, colouration, titrability of polyvalent metal ions, pM indicators, • presence of auxiliary complexing agent, and general structure of complexes formed • with di‐, tri‐, and tetravalent metal ions. • • Complexometric titrations: Direct method, back titration, Replacement titration, • Titration of mixture of metal ions, masking agent (auxiliary ligand) and demasking • agents, and Titration curve w. r. t Disodium Edetate. • • Applications: Determination of individual cations (aluminium by back titration, • nickel by direct titration), determination of mixture of lead, zinc and magnesium in a • sample, and assay of calcium gluconate injection. • ............................................................................................................................................................................................................................................... • Other Important Information is there in the video • If you like this , Don't Forgot to like and share video. • any queries and questions you can comment • If you want ppt, you can contact me on the following mail • Email - [email protected] • Subscribe my channel - / @pharmaknowledge • Music Credits : • Yes you can! – HookSounds • By Audio Library - Free Music • Thanks For Watching.
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