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Sulfuric acid

CAS Registry Number (CASRN):

۷۶۶۴-۹۳-۹ ,

Units of original limits:

mg/m3 ,

Conc dep:

Y ,

name:

Sulfuric acid ,

formula:

H2SO4 ,

appearance:

liquid ,

CAS Registry Number (CASRN):

۷۶۶۴-۹۳-۹ ,

SAX Number:

SOI500 ,

Units of original limits:

mg/m3 ,

Conc dep:

Y ,

p to m:

4.00866 ,

HR:

3 ,

Vapor Pressure:

1461 ,

specific gravity:

1.834 ,

state at 25 °C:

L ,

Molar mass (g/mol):

98/078 ,

Density (g/cm3):

1.84 ,

Melting point (°C):

10 ,

Boiling point (°C):

‎290 ,

comment

sulfuric acid

sulfuric acid, sulfuric also spelled sulphuric (H2SO4), also called oil of vitriol, or hydrogen sulfate, dense, colourless, oily, corrosive liquid; one of the most important of all chemicals, prepared industrially by the reaction of water with sulfur trioxide (see sulfur oxide), which in turn is made by chemical combination of sulfur dioxide and oxygen either by thecontact process or the chamber process. In various concentrations the acid is used in the manufacture of fertilizers, pigments, dyes, drugs, explosives,detergents, and inorganic salts and acids, as well as in petroleum refiningand metallurgical processes. In one of its most familiar applications, sulfuric acid serves as the electrolyte in lead–acid storage batteries.

Pure sulfuric acid has a specific gravity of 1.830 at 25 °C (77 °F); it freezes at 10.37 °C (50.7 °F). When heated, the pure acid partially decomposes into water and sulfur trioxide; the latter escapes as a vapour until the concentration of the acid falls to 98.3 percent. This mixture of sulfuric acid and water boils at a constant temperature of 338 °C (640 °F) at one atmosphere pressure. Sulfuric acid is commonly supplied at concentrations of 78, 93, or 98 percent.

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