Chemicals
TopGeneral Information
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]
TopChemical & Physical Information
| Trivial name | Sodium Hyposulfite |
| Chemical name | Sodium Thiosulfate Pentahydrate |
| Other names | Thio (NL,BE) |
| Type of chemical | Ionic compound (salt) |
| Chemical formula | Na2S2O3, 5H2O |
| CAS number | 7772-98-7 (anhydrous) 10102-17-7 (pentahydrate) |
| Density | 1.667 g·cm-3 |
| Molar mass | 158.1 g·mol-1 |
| Melting point | 48.3 °C |
| Boiling point | 100 °C (decomposition) |
| Soluble | In water |
| Solubility (water, 20 °C) | 700 g·L-1  (anhydrous) |
| Crystal system | Monoclinic |
| Appearance | White crystalline solid |
| Colour | White |
| Safety summary | Safe |
| Safety data | MSDS |
| Storage | Dry |
| Extra | - |
Photos
(3 cm)
Sources
[1] Wikipedia
[2] Specimen from my personal collection, photo taken by me.
[3] Mullin J.W. - Crystallization, 2001
