7664. Potassium Pyrosulfate

Nomenclature

CAS number: 7790-62-7

Disulfuric acid potassium salt (1:2); “anhydrous” potassium acid sulfate.

K₂O₇S₂; mol wt 254.32.

K 30.75%, O 44.04%, S 25.22%.

K₂S₂O₇.

Colorless, fused pieces. d 2.28. mp ≈325°. Sol in water. The aq soln is strongly acid.