8009. Pyrosulfuric Acid

Nomenclature

CAS number: 7783-05-3
Disulfuric acid.
H2O7S2; mol wt 178.14.
H 1.13%, O 62.87%, S 36.00%.
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.