Nomenclature
CAS number: 7727-54-0
Peroxydisulfuric acid ([(HO)S(O)
2]
2O
2) ammonium salt (1:2); ammonium persulfate.
H
8N
2O
8S
2; mol wt 228.20.
H 3.53%, N 12.28%, O 56.09%, S 28.10%.
(NH
4)
2S
2O
8.
Description and references
Available oxygen 7.01%. Contains, when recently
made, 95 to 98% (NH4)2S2O8. Prepd by anodic oxidation of a satd (NH4)2SO4 soln: Feher in Handbook of
Preparative Inorganic Chemistry Vol. 1, G.
Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 390. Toxicity
study: Smyth et al., Am. Ind.
Hyg. Assoc. J. 30, 470 (1969).
Properties
Odorless platelike or prismatic (monoclinic) crystals,
or white granular powder. Stable for months when pure and dry; dec
in presence of moisture, gradually evolving ozone-contg oxygen; dec
on heating, evolving O2 and forming (NH4)2S2O7. d 1.98. Strong oxidizing agent. Freely sol in water; aq
soln is acid and dec slowly at room temp and rapidly at higher temp
evolving O2 and forming NH4HSO4.
Keep dry, in a cool place and protected from
organic matter. LD50 orally in rats: 820 mg/kg (Smyth).Use
As oxidizer and bleacher; to remove hypo; reducer
and retarder in photography; in dyeing, manuf aniline dyes; oxidizer
for copper; etching zinc; decolorizing and deodorizing oils; electroplating;
washing infected yeast; removing pyrogallol stains; making soluble
starch; depolarizer in electric batteries; in analytical chemistry
chiefly for detection and determn of manganese and iron.