Potassium aluminium sulfate Names IUPAC name Aluminium potassium sulfate dodecahydrate Other names Potassium alum Potash alum Alum - (K) phitkari Identifiers CAS Number 10043 - 67 - 1 7784 - 24 - 9 (dodecahydrate) 3D model (JSmol) Interactive image ChEBI CHEBI: 86463 ECHA InfoCard 100.030. 116 PubChem CID 24856 UNII 09OXB01F3O InChI (show) InChI = 1S / Al. K. 2H2O4S / c;; 2 * 1 - 5 (2, 3) 4 / h;; 2 * (H2, 1, 2, 3, 4) / q + 3; + 1;; / p - 4 SMILES (show) (O -) S (= O) (= O) (O -). (O -) S (= O) (= O) (O -). (Al + 3). (K+) Properties Chemical formula KAl (SO) 12H O Molar mass 474.3884 g / mol (Hydrate) Appearance white small crystals Odor watery metallic Density 1.725 g / cm Melting point 92 to 95 ° C (198 to 203 ° F; 365 to 368 K) Boiling point 200 ° C (392 ° F; 473 K) Solubility in water 14.00 g / 100 mL (20 ° C) 36.80 g / 100 mL (50 ° C) Solubility insoluble in acetone Refractive index (n) 1.4564 Hazards NFPA 704 0 0 Except where otherwise noted, data are given for materials in their standard state (at 25 ° C (77 ° F), 100 kPa). N verify (what is?) Infobox references
molar mass of alum kal(so4)2 • 12h2o
474.3884 g / mol (Hydrate)