Pyrosulfuric Acid

Title: Pyrosulfuric Acid
CAS Registry Number: 7783-05-3
CAS Name: Disulfuric acid
Molecular Formula: H2O7S2
Molecular Weight: 178.14
Percent Composition: H 1.13%, O 62.87%, S 36.00%
Line Formula: H2S2O7
Properties: Colorless to slightly yellow, very hygroscopic crystals, fuming strongly in air. d 1.89; mp 35°. Very sol in water with violent hissing and liberation of much heat. Keep tightly closed and handle with caution.
Melting point: mp 35°
Density: d 1.89
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