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Qualitative Analysis

Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...

Crystal Growth: Principles of Crystallization

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...

Anionic Chain-Growth Polymerization: Overview

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

Anionic Chain-Growth Polymerization: Mechanism

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.

Cationic Chain-Growth Polymerization: Mechanism

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

Washing, Drying, and Ignition of Precipitates

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...

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Related Experiment Video

Updated: Jun 25, 2026

Fabrication of VB2/Air Cells for Electrochemical Testing

Fabrication of VB₂/Air Cells for Electrochemical Testing

Published on: August 5, 2013

Materials chemistry: macroporous crystalline vanadium oxide foam.

G T Chandrappa¹, Nathalie Steunou, Jacques Livage

¹Chimie de la Matière Condensée, Université Paris VI, 4 place Jussieu, 75252 Paris, France.

|April 19, 2002

Summary

Researchers developed a simple method to create ultralight, crystalline vanadium oxide foam. This novel technique involves bubbling oxygen gas through a vanadium oxide gel, offering potential for diverse metal oxide applications.

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Last Updated: Jun 25, 2026

Fabrication of VB2/Air Cells for Electrochemical Testing

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Published on: August 5, 2013

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

Area of Science:

Materials Science
Inorganic Chemistry
Nanotechnology

Background:

Porous inorganic solids are crucial in various applications.
Synthesizing complex forms of these materials remains a challenge.
Developing scalable and simple synthesis methods is highly desirable.

Purpose of the Study:

To present a straightforward method for synthesizing ultralight, macroporous, crystalline vanadium oxide foam.
To demonstrate the potential of in-situ gas bubbling for creating complex porous structures.
To explore the applicability of this method to other metal oxides.

Main Methods:

Viscous vanadium oxide gel preparation.
In-situ generation of oxygen gas.
Controlled bubbling of oxygen through the gel to induce foaming and solidification.

Main Results:

Successful synthesis of an ultralight, macroporous, crystalline vanadium oxide foam.
The resulting foam exhibits a unique porous architecture.
The method is simple and utilizes readily available precursors.

Conclusions:

A facile method for creating advanced porous vanadium oxide materials has been established.
The in-situ gas foaming technique offers a promising route for synthesizing ultralight metal oxide foams.
This approach holds potential for broader applications in catalysis, energy storage, and beyond.