Chemical formula of  plaster of paris

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

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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