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Description
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CAS Number 7664-93-9
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Linear Formula H2SO4
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Molecular Weight 98.08
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.
Product Technical bulletin
Product label
Appearance and Odor: Odorless, clear to amber, heavy, oily liquid. A pungent odor may exist if certain impurities are present in the acid.
Physical State: Liquid
Molecular Weight: 98.08
Odor Threshold: Not applicable
Boiling Point: 78%: 193°C (380°F)
93%: 276°C (529°F)
98%:330°C (626°F)
Melting/Freezing Point: 78%: -11.2°C (+11.6°F)
93%: -29.5°C (-21.1°F)
98%: -1.1°C (30°F)
Vapor Pressure at 40°C (102°F): 78%: 1.2 mmHg
93%: 0.0016 mmHg
98%: 0.002 mmHg
Specific Gravity at 15°C (60°F): 78%: 1.7059
93%: 1.8354
98%: 1.8437
Vapor Density: (Air=1): 3.4
Evaporation Rate: Not applicable
Solubility: Easily soluble in cold water (with
liberation of much heat.)
Soluble in ethyl alcohol.
pH: 0.3 (1N solution at 25°C/78°F)