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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...

Factors Affecting Solubility

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:

Retarders

Retarders

Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...

Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

Precipitation Processes

Precipitation Processes

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...

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...

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Related Experiment Video

Updated: Jun 20, 2026

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Published on: August 10, 2016

Lime pretreatment.

Rocio Sierra¹, Cesar Benigno Granda, Mark T Holtzapple

¹Department of Chemical Engineering, Texas A&M University, College Station, TX, USA.

Methods in Molecular Biology (Clifton, N.J.)

|September 22, 2009

Summary

Lime pretreatment effectively reduces lignin in lignocellulosic biomass, enhancing its biodegradability. This method uses calcium hydroxide and water under various conditions to improve biomass processing.

Area of Science:

Biomass Pretreatment
Biochemical Engineering
Sustainable Chemistry

Background:

Lignocellulosic biomass is a key renewable resource.
Efficient pretreatment is crucial for biomass valorization.
Reducing lignin content enhances downstream processing.

Purpose of the Study:

To detail lime pretreatment methods for lignocellulosic biomass.
To investigate the impact of pretreatment conditions on lignin removal.
To assess the resulting increase in biodigestibility.

Main Methods:

Lime pretreatment using calcium hydroxide and water.
Varied conditions: temperature (55-160°C), pressure (atmospheric-200 psig), duration (1h-8 weeks).
Evaluated nonoxidative and oxidative conditions based on lignin content.

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Published on: February 21, 2017

A Novel Method for the Pentosan Analysis Present in Jute Biomass and Its Conversion into Sugar Monomers Using Acidic Ionic Liquid

A Novel Method for the Pentosan Analysis Present in Jute Biomass and Its Conversion into Sugar Monomers Using Acidic Ionic Liquid

Published on: June 1, 2018

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Last Updated: Jun 20, 2026

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Published on: August 10, 2016

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

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A Novel Method for the Pentosan Analysis Present in Jute Biomass and Its Conversion into Sugar Monomers Using Acidic Ionic Liquid

A Novel Method for the Pentosan Analysis Present in Jute Biomass and Its Conversion into Sugar Monomers Using Acidic Ionic Liquid

Published on: June 1, 2018

Main Results:

Lime pretreatment selectively reduces lignin without significant carbohydrate loss.
Biodigestibility of biomass is substantially increased.
Optimal conditions depend on initial lignin concentration (nonoxidative for <18% lignin, oxidative for >18% lignin).

Conclusions:

Lime pretreatment is an effective strategy for enhancing lignocellulosic biomass biodigestibility.
Different pretreatment regimes (short-term, long-term, simple) offer flexibility.
Understanding lignin content is key to selecting appropriate oxidative or nonoxidative conditions.