The chemical formula of Alum is KAl(SO₄)₂·12H₂O
Physical Properties of Al.um:
| Properties |
Details |
| Appearance |
Colorless or white crystals |
| Boiling Point |
Decomposes at high temperatures |
| Crystal System |
Triclinic |
| Density |
1.64 g/cm³ |
| Melting Point |
92-95 °C (198-203 °F) |
| Odor |
Odorless |
| Solubility |
Soluble in water |
Chemical Properties of Alum:
| Property |
Details |
| Chemical Formula |
KAl(SO4)2·12H2O |
| Decomposition |
Decomposes on heating to release water and sulfur trioxide (SO3) |
| Hydrate Structure |
Forms a hydrated crystal lattice structure |
| Molar Mass |
474.39 g/mol |
| pH |
Acidic (around 3) |
| Reactivity |
Reacts with bases, acids, and various metals |
| Solubility |
Soluble in water, insoluble in organic solvents |
Reaction of alum with Transition metal
| Transition metal |
Reactions |
| Iron (Fe) |
Creation of ferric alum (FeAl(SO4)2•12H2O) |
| Copper (Cu) |
Redox Reactions with creation of copper metal and aluminum oxide |
| Lead (Pb) |
Precipitation Reactions with creation of lead sulfate (PbSO4) |
| Zinc (Zn) |
New compound formed with sulfate ion or water molecules |
| Nickel (Ni) |
New compound formed with sulfate ion or water molecules |
| Cobalt (Co) |
New compound formed with sulfate ion or water molecules |
Reaction of alum with Non-metal
| Non-metal |
Reactions |
| Sulfur (S) |
Creation of aluminum sulfide (Al2S3) |
| Carbon (C) |
Reduction of aluminum to produce aluminum metal and carbon dioxide gas |
| Nitrogen (N) |
Creation of aluminum nitride (AlN) |
| Oxygen (O) |
No product |
| Hydrogen (H) |
No product |
| Halogens (F, Cl, Br, I) |
No product |
Reaction of alum with Metalloid
| Metalloid |
Reactions |
| Silicon (Si) |
Creation of aluminum silicate (Al2SiO5) |
| Boron (B) |
Reduction of aluminum to produce aluminum metal and boron oxide gas |
| Arsenic (As) |
Creation of aluminum arsenate (AlAsO4) |
| Germanium (Ge) |
No product |
| Antimony (Sb) |
No product |
| Tellurium (Te) |
No product |
Reaction of alum with Lanthanide
| Lanthanide |
Reactions |
| Cerium (Ce) |
Creation of CeAl11O18 |
| Europium (Eu) |
Reduction of aluminum to produce aluminum metal and europium oxide gas |
| Gadolinium (Gd) |
Creation of GdAl11O18 |
| Lanthanum (La) |
No product |
| Praseodymium (Pr) |
No product |
| Neodymium (Nd) |
No product |
| Samarium (Sm) |
No product |
| Europium (Eu) |
Reduction of aluminum to produce aluminum metal and europium oxide gas |
| Terbium (Tb) |
No product |
| Dysprosium (Dy) |
No product |
| Holmium (Ho) |
No product |
| Erbium (Er) |
No product |
| Thulium (Tm) |
No product |
| Ytterbium (Yb) |
No product |
| Lutetium (Lu) |
No product |
Reaction of alum with Actinide
| Actinide |
Reactions |
| Uranium (U) |
Creation of UAl4 |
| Plutonium (Pu) |
No product |
| Americium (Am) |
No product |
| Curium (Cm) |
No product |
| Berkelium (Bk) |
No product |
| Californium (Cf) |
No product |
| Einsteinium (Es) |
No product |
| Fermium (Fm) |
No product |
| Mendelevium (Md) |
No product |
| Nobelium (No) |
No product |
| Lawrencium (Lr) |
No product |
| Thorium (Th) |
Creation of ThAl12 |
| Protactinium (Pa) |
No product |
| Neptunium (Np) |
No product |
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