Chemical formula of plaster of paris
Chemical formula of plaster of paris is CaSO4·1/2H2O.Physical Properties of Plaster of Paris:
| Properties | Details |
| Appearance | White, fine powder |
| Compressive Strength | Low initial strength, becomes stronger over time |
| Density | 2.32 g/cm³ |
| Hardness | Soft and brittle |
| Melting Point | Decomposes at around 150°C (302°F) |
| Odor | Odorless |
| Particle Size | Fine particles |
| Setting Time | Rapid setting time |
| Solubility | Insoluble in water |
Chemical Properties of Plaster of Paris:
| Property | Description |
| Absorption | Absorbs water when exposed to humid environments |
| Chemical Formula | CaSO₄ · 0.5H₂O |
| Chemical Reaction | When mixed with water, it undergoes hydration and forms gypsum |
| Flame Resistance | Non-combustible material |
| Hydration | CaSO₄ · 0.5H₂O + 1.5H₂O → CaSO₄ · 2H₂O (gypsum) |
| pH | Slightly acidic (around pH 6) |
| Reactivity | Reacts with acids to form calcium salts |
| Reversibility | It can be dehydrated by heating, and revert back to plaster |
| Stability | Stable under normal conditions |
Reaction of plaster of paris with Alkali metal
| Alkali metal | Reaction with plaster of Paris |
| Lithium (Li) | 4Li + CaSO4·1/2H2O react and change into CaSO4·2LiOH + 3H2O |
| Sodium (Na) | 2Na + CaSO4·1/2H2O react and change into CaSO4·Na2SO4·2H2O + H2 |
| Potassium (K) | 2K + CaSO4·1/2H2O react and change into CaSO4·K2SO4·2H2O + H2 |
| Rubidium (Rb) | 2Rb + CaSO4·1/2H2O react and change into CaSO4·Rb2SO4·2H2O + H2 |
| Cesium (Cs) | 2Cs + CaSO4·1/2H2O react and change into CaSO4·Cs2SO4·2H2O + H2 |
| Francium (Fr) | no reaction |
Reaction of plaster of paris with Alkaline earth metal
| Alkaline earth metal | Reaction with plaster of Paris |
| Beryllium (Be) | 2Be + CaSO4·1/2H2O react and change into CaSO4·BeSO4·4H2O |
| Magnesium (Mg) | Mg + CaSO4·1/2H2O react and change into CaSO4·2H2O + Mg(OH)2 |
| Calcium (Ca) | Ca + CaSO4·1/2H2O react and change into 3CaSO4·2H2O |
| Strontium (Sr) | Sr + CaSO4·1/2H2O react and change into CaSO4·SrSO4·2H2O |
| Barium (Ba) | Ba + CaSO4·1/2H2O react and change into CaSO4·BaSO4·2H2O |
| Radium (Ra) | Ra + CaSO4·1/2H2O No reaction |
Reaction of plaster of paris with Transition metal
| Transition metal | Reaction with plaster of Paris |
| Iron (Fe) | Fe + CaSO4·1/2H2O react and change into CaSO4·FeSO4·2H2O |
| Copper (Cu) | Cu + CaSO4·1/2H2O no product |
| Zinc (Zn) | Zn + CaSO4·1/2H2O react and change into CaSO4·ZnSO4·2H2O |
| Silver (Ag) | Ag + CaSO4·1/2H2O no product |
| Gold (Au) | Au + CaSO4·1/2H2O no product |
Reaction of plaster of paris with Non-transition metal
| Non-transition metal | Reaction with plaster of Paris |
| Aluminum (Al) | 2Al + 3CaSO4·1/2H2O react and change into 3CaSO4·Al2(SO4)3·14H2O |
| Boron (B) | B + CaSO4·1/2H2O no product |
| Carbon (C) | C + CaSO4·1/2H2O no product |
| Nitrogen (N) | N2 + CaSO4·1/2H2O no product |
| Oxygen (O) | O2 + CaSO4·1/2H2O no product |
| Silicon (Si) | Si + CaSO4·1/2H2O no product |
Reaction of plaster of paris with Non-metallic element
| Non-metallic element | Reaction with plaster of Paris |
| Hydrogen (H) | H2 + CaSO4·1/2H2O no product |
| Helium (He) | He + CaSO4·1/2H2O no product |
| Carbon (C) | C + CaSO4·1/2H2O no product |
| Nitrogen (N) | N2 + CaSO4·1/2H2O no product |
| Oxygen (O) | O2 + CaSO4·1/2H2O no product |
| Fluorine (F) | F2 + CaSO4·1/2H2O no product |
| Neon (Ne) | Ne + CaSO4·1/2H2O no product |
| Phosphorus (P) | P4 + 5CaSO4·1/2H2O react and change into 3Ca3(PO4)2·CaSO4·5H2O |
| Sulfur (S) | S + CaSO4·1/2H2O react and change into CaSO4·S |
| Chlorine (Cl) | Cl2 + CaSO4·1/2H2O no product |
| Argon (Ar) | Ar + CaSO4·1/2H2O no product |
Reaction of plaster of paris with Lanthanide
| Lanthanide | Reaction with plaster of Paris |
| Cerium (Ce) | 2Ce + 3CaSO4·1/2H2O react and change into 3CaCe(SO4)2·2H2O |
| Praseodymium (Pr) | 2Pr + 3CaSO4·1/2H2O react and change into 3CaPr(SO4)2·2H2O |
| Neodymium (Nd) | 2Nd + 3CaSO4·1/2H2O react and change into 3CaNd(SO4)2·2H2O |
| Samarium (Sm) | 2Sm + 3CaSO4·1/2H2O react and change into 3CaSm(SO4)2·2H2O |
| Europium (Eu) | 2Eu + 3CaSO4·1/2H2O react and change into 3CaEu(SO4)2·2H2O |
| Gadolinium (Gd) | 2Gd + 3CaSO4·1/2H2O react and change into 3CaGd(SO4)2·2H2O |
Reaction of plaster of paris with Actinide
| Actinide | Reaction with plaster of Paris |
| Uranium (U) | U + 2CaSO4·2H2O react and change into CaUO4·2H2O + 2CaSO4·1/2H2O |
| Plutonium (Pu) | Pu + 2CaSO4·2H2O react and change into CaPuO4·2H2O + 2CaSO4·1/2H2O |
| Americium (Am) | Am + 2CaSO4·2H2O react and change into CaAmO4·2H2O + 2CaSO4·1/2H2O |
| Curium (Cm) | Cm + 2CaSO4·2H2O react and change into CaCmO4·2H2O + 2CaSO4·1/2H2O |
| Californium (Cf) | Cf + 2CaSO4·2H2O react and change into CaCfO4·2H2O + 2CaSO4·1/2H2O |
| Einsteinium (Es) | Es + 2CaSO4·2H2O react and change into CaEsO4·2H2O + 2CaSO4·1/2H2O |
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