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Precipitation and Co-precipitation

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Precipitation Gravimetry

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Curiosidades en los patrones periódicos de precipitación

S C Müller, S Kai, J Ross

Science (New York, N.Y.)

|May 7, 1982

Resumen

Los investigadores observaron patrones complejos de Liesegang más allá de los típicos anillos y bandas. Estas intrincadas estructuras incluyen brechas radiales, segmentación, patrones irregulares y nuevas bandas de precipitación en espiral, ampliando nuestra comprensión de los fenómenos de precipitación química.

Área de la Ciencia:

Dinámica de las precipitaciones químicas.
La formación de patrones en los sistemas químicos.

Sus antecedentes:

Los patrones de Liesegang generalmente se forman como anillos concéntricos o bandas paralelas.
Las observaciones anteriores se han centrado principalmente en estas estructuras más simples y bien definidas.

Objetivo del estudio:

Para documentar y caracterizar patrones complejos de Liesegang.
Para investigar las desviaciones de la formación estándar de las bandas de Liesegang.

Principales métodos:

Observación visual y documentación de los patrones de precipitación.
Análisis de anomalías estructurales en experimentos de precipitación química.

Principales resultados:

Patrones observados de Liesegang que exhiben brechas radiales y segmentación.

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Se identificaron patrones irregulares dentro de las estructuras de anillos concéntricos.

Documentó la formación de bandas de precipitación en espiral, que se desvían de la formación de bandas paralelas.

Conclusiones:

La formación de patrones de Liesegang puede dar lugar a estructuras significativamente más complejas de lo que se reconocía anteriormente.
Estos patrones complejos ofrecen nuevos conocimientos sobre los mecanismos que rigen la precipitación química y la autoorganización.