Nomenclature
CAS number: 7783-18-8
Thiosulfuric acid (H
2S
2O
3)
ammonium salt (1:2); Ammonium hyposulfite.
H
8N
2O
3S
2; mol wt 148.21.
H 5.44%, N 18.90%, O 32.39%, S 43.27%.
(NH
4)
2S
2O
3.
Description and references
Prepn: Gmelins, Ammonium (8th ed.) 23, pp 304-306 (1936). Crystal structure:
S. T. Teng et al., Acta Crystallogr. B35, 1682 (1979).
Properties
Crystals, dec at 150°. Sol in water; insol in
alc, ether.Use
To clean “white” metal; in photography; in lubricants
for metal cold-working.