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| Names | |||
|---|---|---|---|
| IUPAC name
Sulfuric acid
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Other names
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| Identifiers | |||
3D model (JSmol)
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| ChEBI | |||
| ChEMBL | |||
| ChemSpider | |||
| ECHA InfoCard | 100.028.763 | ||
| EC Number |
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| E number | E513 (acidity regulators, ...) | ||
| 2122 | |||
| KEGG | |||
PubChem CID
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| RTECS number |
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| UNII | |||
| UN number | 1830 | ||
CompTox Dashboard (EPA)
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| Properties | |||
| H2SO4, sometimes expressed (HO)2SO2 | |||
| Molar mass | 98.079 g/mol | ||
| Appearance | Colorless viscous liquid | ||
| Odor | Odorless | ||
| Density | 1.8302 g/cm3, liquid[1] | ||
| Melting point | 10.31[1] °C (50.56 °F; 283.46 K) | ||
| Boiling point | 337[1] °C (639 °F; 610 K) When sulfuric acid is above 300 °C (572 °F; 573 K), it gradually decomposes to SO3 + H2O | ||
| miscible, exothermic | |||
| Vapor pressure | 0.001 mmHg (20 °C)[2] | ||
| Acidity (pKa) | pKa1 = −2.8 pKa2 = 1.99 | ||
| Conjugate base | Bisulfate | ||
| Viscosity | 26.7 cP (20 °C) | ||
| Structure[3] | |||
| monoclinic | |||
| C2/c | |||
a = 818.1(2) pm, b = 469.60(10) pm, c = 856.3(2) pm α = 90°, β = 111.39(3)
°, γ = 90° | |||
Formula units (Z)
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4 | ||
| Thermochemistry | |||
Std molar
entropy (S⦵298) |
157 J/(mol·K)[4] | ||
Std enthalpy of
formation (ΔfH⦵298) |
−814 kJ/mol[4] | ||
| Hazards | |||
| GHS labelling: | |||
 
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| Danger | |||
| H314 | |||
| P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501 | |||
| NFPA 704 (fire diamond) | |||
