Chemicals
TopGeneral Information
Potassium alum is one of the possible combinations of alum. There is also chrome alum and ammonium alum.[1]
TopChemical & Physical Information
| Trivial name | Potassium alum |
| Chemical name | Potassium aluminum sulfate, dodecahydrate |
| Other names | Kalium aluin (NL,BE) |
| Type of chemical | Ionic compound (salt) |
| Chemical formula | KAl(SO4)2, 12H2O |
| CAS number | 10043-67-1 (anhydrous) 7784-24-9 (dodecahydrate) |
| Density | 1.76 g·cm-3 |
| Molar mass | 258.207 g·mol-1 |
| Melting point | 92-93 °C |
| Boiling point | 200 °C |
| Soluble | In water |
| Solubility (water, 20 °C) | 118 g·L-1  (anhydrous) |
| Crystal system | Cubic |
| Appearance | White crystalline solid |
| Colour | White |
| Safety summary | Safe |
| Safety data | MSDS |
| Storage | Dry |
| Extra | - |
For more information, also look at the potassium alum crystals.
TopPhotos
(3 cm)
Sources
[1] Wikipedia
[2] Specimen from my personal collection, photo taken by me.
[3] Mullin J.W. - Crystallization, 2001
