What is Silicic Gel? Is silicic acid colloidal

Silicic acid. Chemical name: Silicic acid (Si(OH)4, or H4SiO4).

Chemical Description: The simple silicic acid is orthosilicic acid Si(OH)4, or written as H4SiO4, and the ionization equilibrium constant k1=. It is a weak acid, and its salts have hydrolysis in aqueous solution.

Free silicic acids, including metasilicic acid (H2SiO3) and disililicic acid (H2Si2O5), are very weakly acidic. The ionization equilibrium constant of metasilicic acid k1 = 2 * 10-10 (room temperature), orthosilicic acid is stable in the range of pH2-3, but if the supersaturated H4SiO4 solution is left for a long time, there will be amorphous silica precipitation, which is a milky white precipitate, and appears as colloidal particles, precipitates or gels. Some of the water in the gel evaporates to give a porous, dry solid gel, the common silica gel.

This silicate gel has strong adsorption properties and can be used as a moisture absorbing desiccant, catalyst, or as a carrier for other catalysts.

Preparation: Hydrochloric acid and sodium silicate react to produce silicic acid (acids and silicates that are more acidic than silicic acid).

Whether the silicate sol is colloidal or not is related to the concentration, and when the concentration reaches a certain level, it is colloidal. Silicic acid with the chemical formula H2SiO3. It is a weak acid, and its salts are hydrolyzed in aqueous solution.

Free silicic acids, including orthosilicic acid (H4SiO4), metasilicic acid (H2SiO3), and disililicic acid (H2Si2O5), are very weakly acidic.

Colloidal silica

Colloidal silica is a dispersion of nano-scale di-skin silica particles in water or in a macro-differential solvent. Since SiO2 in silica sol contains a large amount of water and hydroxyl groups, silica sol can also be expressed as. There are different pathways to prepare colloidal silica.

The most commonly used methods are ion exchange method, silicon powder one-step hydrolysis method, silane hydrolysis method, etc.

Uses:

1.It is used as a binder for various refractory materials, and has the characteristics of strong adhesion and high temperature resistance (1500°C-1600°C).

2.Used in the coating industry, it can make the coating firm, and can resist pollution and dust, aging, fire and other functions.

3.It is used for thin shell precision casting, which can make the shell type strong and high casting finish. Using its Jeju shape is more than the water glass shape, replacing the ethyl silicate shape can reduce costs and improve operating conditions.

Question 1: Is silicic acid solution colloidal? No.

Silicate sol is also known as silica sol. A colloidal solution of a polymolecular polymer of silicic acid. Milky. When the concentration is high, it is gelatinous. It is formed by the reaction of sodium silicate solution with weak acid or the exchange of sodium ions through an iodized medium.

Silicate colloids are colorless.

Fill a large test tube with hydrochloric acid and add water glass, then shake vigorously. Experimental Phenomenon Silicate sol is transparent.

But there will be a Tyndall phenomenon and so on. Not a solution. But the colloid is not cloudy and is as transparent as an egg white solution.

There is a certain difference between the two things. Sol is a solution of colloids, whereas colloids are semi-solids that are transparent like egg white solutions.

Question 2: Is silicic acid colloidal? No, high school chemistry!

Question 3: What are silica gel, silicate colloid, and silicone gel, and are they pure or mixtures? He took Hu, which ones are organic and which ones are colloidal? Thank you Silicone::XSio2 YH2O, mixture; In small amounts, colloids;

Silicate colloid: H2SIO3 (main component), mixture; It's colloidal;

Silicic Acid Gel:: XSIO2 YH2O, mixture; In small amounts, colloids;

There is no organic matter in them.

Colloid, also known as colloidal dispersion, is a homogeneous mixture in which two different states of substances are contained: one dispersed and the other continuous.

The dispersed part is composed of tiny particles or droplets, and the diameter of the dispersed particles is between 1 nm and 100 nm; Colloids are a kind of dispersion systems with a diameter of dispersed particles between the coarse dispersion system and the solution, which is a highly dispersed multiphase heterogeneous system.

According to the state of the dispersant, it can be divided into: aerosol, liquid sol and solid sol.

Common colloids are: Fe(OH)3 colloid, Al(OH)3 colloid, silicate colloid, starch colloid, protein colloid, soybean milk, ink, paint, soapy water, AG2S, AS2S3, colored glass, jelly, egg white, blood, etc.

Question 4: Is the silicic acid solution colloidal Yes,