Chemicals

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General Information

Sodium Hyposulfite

Sodium hyposulfite is used by photographers as fixing salt when they develop their photos. It can also easily be turned into a supercooled liquid (see video 3 and 6 here)[1]

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Chemical & Physical Information

Trivial nameSodium Hyposulfite
Chemical nameSodium Thiosulfate Pentahydrate
Other namesThio (NL,BE)
Type of chemicalIonic compound (salt)
Chemical formulaNa2S2O3, 5H2O
CAS number7772-98-7 (anhydrous)
10102-17-7 (pentahydrate)
Density1.667 g·cm-3
Molar mass158.1 g·mol-1
Melting point48.3 °C
Boiling point100 °C (decomposition)
SolubleIn water
Solubility (water, 20 °C)700 g·L-1 Sodium hyposulfite solubility graph. (anhydrous)
Crystal systemMonoclinic
AppearanceWhite crystalline solid
ColourWhite
Safety summarySafe
Safety dataMSDS
StorageDry
Extra-
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Photos

Sodium Hyposulfite

(3 cm)

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Sources

[1] Wikipedia

[2] Specimen from my personal collection, photo taken by me.

[3] Mullin J.W. - Crystallization, 2001