Sulfuric Acid 97%, 5L   Sulfuric acid (alternative spelling sulphuric acid), also known as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with molecular formula H2SO4. It is a colorless, odorless, and viscous liquid that is soluble in water and is synthesized in reactions that are highly exothermic. vapor density <0.3 (25 °C, vs air) vapor pressure 1 mmHg ( 146 °C) description Nominally 95-98% H2SO4 assay 97% color clear bp ~290 °C (lit.) density 1.840 g/mL at 25 °C (lit.) SMILES string OS(O)(=O)=O InChI 1S/H2O4S/c1-5(2,3)4/h(H2,1,2,3,4) InChI key QAOWNCQODCNURD-UHFFFAOYSA-N