Chemical formula of plaster of paris
Chemical formula of plaster of paris is CaSO
4·1/2H
2O.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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