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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