Oturum Aç

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.

Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For example, during the precipitation of cadmium sulfide, manganese in the solution can replace cadmium to form a mixed crystal. Similarly, magnesium ammonium phosphate can be contaminated by potassium ions in the solution, resulting in mixed crystals of magnesium potassium phosphate. The formation of mixed crystals can be prevented by removing the interfering ion or using a different precipitant.

Coprecipitation can also occur via occlusion, where foreign ions are trapped within the growing lattice. Similarly, pockets of solution are trapped between adjacent crystals in mechanical entrapment. Slow precipitation can minimize occlusion, whereas rapid dissolution and reprecipitation in a clean, fresh solvent can remove it.

Etiketler

CoprecipitationContaminationPrecipitateSoluble SpeciesColloidal PrecipitatesSurface AdsorptionBarium SulfateIsomorphous ReplacementMixed CrystalsCadmium SulfideMagnesium Ammonium PhosphatePotassium IonsOcclusionMechanical EntrapmentSlow PrecipitationRapid Dissolution

Bölümden 5:

article

Now Playing

5.21 : Types of Coprecipitation

Complexometric Titration, Precipitation Titration, and Gravimetry

489 Görüntüleme Sayısı

article

5.1 : Complexometric Titration: Overview

Complexometric Titration, Precipitation Titration, and Gravimetry

4.1K Görüntüleme Sayısı

article

5.2 : Complexometric Titration: Ligands

Complexometric Titration, Precipitation Titration, and Gravimetry

795 Görüntüleme Sayısı

article

5.3 : Properties of Organometallic Compounds

Complexometric Titration, Precipitation Titration, and Gravimetry

818 Görüntüleme Sayısı

article

5.4 : EDTA: Chemistry and Properties

Complexometric Titration, Precipitation Titration, and Gravimetry

1.5K Görüntüleme Sayısı

article

5.5 : EDTA: Conditional Formation Constant

Complexometric Titration, Precipitation Titration, and Gravimetry

617 Görüntüleme Sayısı

article

5.6 : EDTA: Auxiliary Complexing Reagents

Complexometric Titration, Precipitation Titration, and Gravimetry

492 Görüntüleme Sayısı

article

5.7 : EDTA: Direct, Back-, and Displacement Titration

Complexometric Titration, Precipitation Titration, and Gravimetry

1.9K Görüntüleme Sayısı

article

5.8 : EDTA: Indirect and Alkalimetric Titration

Complexometric Titration, Precipitation Titration, and Gravimetry

635 Görüntüleme Sayısı

article

5.9 : Complexometric EDTA Titration Curves

Complexometric Titration, Precipitation Titration, and Gravimetry

694 Görüntüleme Sayısı

article

5.10 : Effects of EDTA on End-Point Detection Methods

Complexometric Titration, Precipitation Titration, and Gravimetry

209 Görüntüleme Sayısı

article

5.11 : Masking and Demasking Agents

Complexometric Titration, Precipitation Titration, and Gravimetry

2.1K Görüntüleme Sayısı

article

5.12 : Precipitation Titration: Overview

Complexometric Titration, Precipitation Titration, and Gravimetry

3.8K Görüntüleme Sayısı

article

5.13 : Precipitation Titration Curve: Analysis

Complexometric Titration, Precipitation Titration, and Gravimetry

915 Görüntüleme Sayısı

article

5.14 : Precipitation Titration: Endpoint Detection Methods

Complexometric Titration, Precipitation Titration, and Gravimetry

1.4K Görüntüleme Sayısı

See More

JoVE Logo

Gizlilik

Kullanım Şartları

İlkeler

Araştırma

Eğitim

JoVE Hakkında

Telif Hakkı © 2020 MyJove Corporation. Tüm hakları saklıdır