How silica produces its counterpart, orthosilicic acid

Silica is used in the manufacture of flat glass, glass products, foundry sand, fiberglass, ceramic glaze, sandblasting for rust prevention, sand for filtration, fluxes, refractories, and in the manufacture of lightweight bubble concrete. Silica has a wide range of uses. Crystals, which are relatively rare in nature, can be used to make important components for the electronics industry, optical instruments and handicrafts.

Silica is an important raw material for the manufacture of optical fibers. Generally, the purer quartz can be used to make quartz glass. Quartz glass has a very small expansion coefficient, equivalent to 1 18 of ordinary glass, can withstand drastic changes in temperature, and has good acid resistance (except HF), therefore, quartz glass is often used to manufacture chemical instruments with high temperature resistance.

Quartz sand is often used as a raw material for glass and as a building material. Silica is used in the manufacture of glass, quartz glass, water glass, optical fibers, electronic industry....

Here's an example:

After the broken porcelain is glued with egg white, because the egg white is an alkaline substance, and the main components in the porcelain are silica and silicate, and the reaction will form orthosilicic acid. So after drying, it will be strong.

It can be seen that silicon dioxide (or silicate) reacts with egg white at room temperature to form orthosilicic acid.

After hot dissolution with NaOH solution, acid is added to neutralize it, and the resulting gelatinous substance is formed.

Silica is not an anhydride, so it is treated with a strong alkali and then precipitated with acid.

The relationship between silica and silicate is that there is a difference of one oxygen atom, and the mass fraction of silica is the mass fraction of silica when one oxygen atom is removed from the silicate. The mass fraction of silicon dioxide plus the monooxide atom is the mass fraction of silicate.

In addition, silica can be turned into silicate by adding strong alkalis such as sodium hydroxide, and orthosilicic acid can be obtained by adding strong acids. Silica is an inorganic substance, silicon atoms and oxygen atoms are arranged in a long-range order to form crystalline silica, and short-range ordered or long-range disordered arrangements to form amorphous silica.

Silica material structure

Silicon and carbon have similar properties, but the properties of their oxides are very different. In the crystal structure, the four valence electrons of the silicon atom form four covalent bonds with the four oxygen atoms, the Si atom is in the center of the tetrahedral body, and the O atom is located at the apex of the tetrahedron.

Each silicon atom is attached to four oxygen atoms, and each oxygen atom is attached to two silicon atoms. The smallest ring in the crystal is composed of 12 atoms (6 silicon atoms and 6 oxygen atoms), each silicon is shared by 6 rings, and the ratio of the number of silicon-oxygen atoms in the crystal is 1:2.

The above information reference: Encyclopedia - Silicon Dioxide.

sio₂+3c=sic+2co

sio₂+2sic=3si+2co

sio₂+sic+c=2si+2co

If C is insufficient, it is estimated that some of the SiC will be generated, and some of the Sio will be generated while the Co should be generated by the reaction of C and O.

c+o₂=co₂

Silica is widely used, mainly used to make glass, water glass, pottery, enamel, refractory materials, aerogel felt, ferrosilicon, molding sand, elemental silicon, cement, etc., in ancient times, silica was also used to make the glaze and carcass of porcelain. Ordinary stones are mainly composed of silica and calcium carbonate.

1.Silicon and oxygen are heated to produce silica, and because silicon is not very reactive, this reaction is very slow.

2.Silica, the chemical term, pure silica is colorless, solid at room temperature, insoluble in water.

3.Insoluble in acids, but soluble in hydrofluoric acid and hot concentrated phosphoric acid, can work with molten alkalis.

4.There are two kinds of natural rent, crystalline silica and amorphous silica.

5.Silica is widely used, mainly used to make glass, water glass, pottery, enamel, refractory materials, gas and gel felt, ferrosilicon, molding sand, elemental silicon, cement, etc., in ancient times, silica was also used to make porcelain glaze and carcass.

6.Ordinary stones are mainly composed of silica and calcium carbonate.

7.Silicon (called silicon in Taiwan and Hong Kong) is a chemical element, formerly known as silicon.

(High temperature).

2.Some oxides can oxidize silicon to silicon dioxide at high temperatures:

Si + 2H2O = SiO2 + 2H2 (more than 1000 degrees) Si + 2Feo = SiO2 + 2Fe (1700K) 3Silicon and some non-metals can be hydrolyzed by hydrolysis of reaction products at high temperature in wax to obtain silicic acid distribution, and silicon dioxide can be obtained by burning the wheel and selling the mountain.

For example: Si+2Cl2=SiCl4(770K)SiCl4+3H2O=4HCl+H2SiO3H2SiO3=SiO2+H2O (heating).

Steps: SiO2+2NaOH = Na2SiO3 + H2ONa2SiO3 + CO2 + H2O=H2SiO3 + Na2CO3 Note: The preparation of general acids can be prepared by the reaction of acid anhydride with water, but silica is insoluble in water and can react with alkali Zhaohe Cong, so the above method is used.

In addition: SiO2 + Na2CO3 = Na2SiO3 + CO2, the reaction is carried out under high temperature conditions, and is generally not used to make silicic acid.

Hope it helps, satisfied, dear!

Preparation of crude silicon: SiO2 + 2C == High temperature == Si + 2 CO

Preparation of pure silicon: SiO2 + 2C = = high eggplant grip temperature trembling dongqing == Si + 2 Co

Si + 2 Cl2 == High Temperature == SiCl4 SiCl4 + 2 H2 == High Temperature == Si + 4 HCl

Silica and basic oxides.

SiO2 Cao = (High Temperature) Casio3 Silica is soluble in a strong alkaline solution with concentrated heat:

sio2 ＋ 2naoh = na2sio3 ＋ h2o