Nomenclature
CAS number: 7727-21-1
Peroxydisulfuric acid ([(HO)S(O)
2]
2O
2) potassium salt (1:2); potassium peroxydisulfate.
K
2O
8S
2; mol wt 270.32.
K 28.93%, O 47.35%, S 23.72%.
K
2S
2O
8.
Description and references
The article of commerce contains 93-97% K2S2O8.
Properties
Colorless or white, odorless crystals. Oxidizer. Keep well closed in a cool place. Gradually dec, losing available oxygen; dec more quickly at higher
temps; completely dec ≈100°. Sol in ≈50 parts water, 25 parts water
at 40°. Aq soln dec at ordinary temp and more rapidly on warming;
aq soln is acid. Insol in alc.Use
Bleaching fabrics, soaps; in photography under the
name
Anthion to remove last traces of thiosulfate from plates and paper;
as an oxidizing agent in analytical chemistry.