Sulfuric acid (chemical formula: H2SO4), the most important oxygenated acid of sulfur. Anhydrous sulfuric acid is a colorless oily liquid that crystallizes at 10.36°C. Usually used are aqueous solutions of it in various concentrations, obtained by the tower method and the contact method. The former obtained for crude dilute sulfuric acid, mass fraction is generally about 75%; the latter can be obtained mass fraction of 98.3% of the concentrated sulfuric acid, boiling point 338 ℃, relative density 1.84.

Sulfuric acid is one of the most active binary inorganic strong acids and can react with most metals. High concentrations of sulfuric acid are strongly absorbent and can be used as a dehydrating agent to carbonize carbohydrate-containing materials such as wood, paper, cotton and linen fabrics, and biological flesh. When mixed with water, it also releases a lot of heat energy. It has strong corrosive and oxidizing properties, so it should be used with caution. It is an important industrial raw material, which can be used in the manufacture of fertilizers, drugs, explosives, pigments, detergents, storage batteries, etc. It is also widely used in the purification of petroleum, metal smelting and dyestuffs and other industries. It is often used as chemical reagent, and can be used as dehydrating agent and sulfonation agent in organic synthesis.

Save

Keep sealed and dry.

Use

In the electronics industry, used as a strong acidic cleaning corrosive, integrated circuit manufacturing for silicon cleaning, can be used in conjunction with hydrogen peroxide. The etching of organic materials is mainly used in positive gel developing solution and graphic after the stripping solution ( degumming agent ) H202 a H2SO4.

Molecular Formula

H₂SO₄

Molecular Mass

98.078

Standard Conditions

Transparent colorless and odorless liquid

Densities

1.8305 g/cm³

Melting Point

10.371 ℃

Boiling

337 ℃

Solubility

Mutually soluble in water in any ratio

Vapor Pressure

6×10⁻⁵ mmHg

Dynamic Viscosity

0.021 Pa s (25℃)

Surface Tension

0.0735 N/m

Index of Refraction

1.41827

Thermal Capacity

1.416 J/(g K) (STP)

Heat of Vaporization

0.57 kJ/g (STP)

Melting Heat

0.1092 kJ/g (STP)

CAS Registration Number

7664-93-9