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Disulfuric acid

Chemical compound
Disulfuric acid or pyrosulfuric acid, also named oleum, is a sulfur oxoacid. It is a major constituent of fuming sulfuric acid, oleum, and this is how most chemists encounter it. As confirmed by X-ray crystallography, the molecule consists of a... Wikipedia
Formula: H2S2O7
Molar mass: 178.14 g/mol
3D model (JSmol): Interactive image; Interactive image; Interactive image
Conjugate base: Disulfate
Melting point: 36 °C (97 °F; 309 K)