Chapter 5
Complexometric Titration, Precipitation Titration, and Gravimetry
Valoración complexométrica: descripción general
Complexometric titrations involve reactions of ligands with suitable metal ions to generate metal–ligand complexes.
The titration is often performed ...
Valoración complexométrica: ligandos
Complexation titrations may employ different monodentate or polydentate ligands.
Polydentate ligands, such as derivatives of amino carboxylic acids, ...
Propiedades de los compuestos organometálicos
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl ...
EDTA: Química y Propiedades
In complexation reactions, although ligands of various denticities can be used, polydentate ligands are generally preferred, as they form highly stable ...
EDTA: Constante de Formación Condicional
Each EDTA molecule has six binding sites: four carboxyl groups and two amino groups. The fully protonated form of EDTA is represented as H6Y2+. However, ...
EDTA: Reactivos Complejos Auxiliares
EDTA titrations require high-pH conditions, under which the active complexing form of EDTA predominates.
However, under alkaline conditions, many metal ...
EDTA: Valoración directa, trasera y de desplazamiento
The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering ...
EDTA: Valoración indirecta y alcalina
Like direct, back, and displacement titration, indirect titration is an EDTA titration involving metal ions.
In an indirect titration, anions are ...
Curvas de valoración EDTA complexométricas
EDTA titration curves determine the free metal ion concentration. The titration curve represents the change in concentration of free metal ions (p ...
Efectos del EDTA en los métodos de detección de puntos finales
End-point detection in EDTA titration includes visual and instrumental methods.
A visual metal-ion indicator, which forms a stable complex with a metal ...
Enmascaramiento y desenmascaramiento de agentes
The selectivity of EDTA reactions is improved by masking and demasking agents.
A masking agent chelates with a potential interfering ion to form a more ...
Valoración de la precipitación: Visión general
In precipitation titrations, the analyte mixed with visual indicators reacts with the titrant to form a colored precipitate or a soluble, colored complex ...
Curva de valoración de la precipitación: análisis
In the titration of chloride with silver nitrate, the initial silver ion concentration is low due to the limited redissolution of the sparingly soluble ...
Valoración de la precipitación: métodos de detección de puntos finales
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a ...
Gravimetría: Visión general
Gravimetry is a quantitative analytical method where the analyte is isolated and weighed either directly or after conversion into a substance of known ...
Gravimetría: Agentes precipitantes inorgánicos y orgánicos
Common inorganic precipitants yield insoluble precipitates that can be used to quantify several cations and anions.
The formation of precipitates such as ...
Gravimetría de precipitación
In precipitation gravimetry, the analyte reacts with a precipitant to yield a precipitate that is isolated and weighed.
The precipitate should be of low ...
Formación de precipitados y control del tamaño de partícula
In precipitation gravimetry, ideally, the precipitant reacts specifically or selectively with the analyte to yield a precipitate with certain attributes.
...
Procesos de precipitación
Slow addition of the precipitant in a dilute solution with constant stirring lowers the solute concentration, that is, Q, decreasing the relative ...
Precipitados coloidales
Colloidal precipitates have a large surface-to-mass ratio that encourages surface adsorption.
For example, colloidal silver chloride obtained by adding ...
Tipos de coprecipitación
Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes.
Surface adsorption can introduce ...
Lavado, secado e ignición de precipitados
Following filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor.
Colloidal precipitates, such as ...
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