NCERT Solution for Class Tenth Science Chapter 2
Acids, Bases and Salts
Intext Questions
Page No-17
Questions No-5
Write an equation to show the reaction between Plaster of Paris and water.
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Plaster of Paris is a white powder and on mixing with water, it changes to gypsum giving a hard solid mass.
𝐶𝑎𝑆𝑂₄.1/2𝐻2𝑂+3/2H₂ 𝑂 → 𝐶𝑎𝑆𝑂₄.2𝐻₂𝑂
The chemical equation when Plaster of Paris and water reacts:
𝐶𝑎𝑆𝑂₄.1/2𝐻2𝑂+3/2H₂ 𝑂 → 𝐶𝑎𝑆𝑂₄.2𝐻₂𝑂
The reaction between Plaster of Paris (CaSO₄ . 1/2 H₂O) and water involves the rehydration of Plaster of Paris to form Gypsum (CaSO₄ . 2H₂O). The chemical equation for this reaction is:
CaSO₄ . 1/2 H₂O + 3/2H₂O →CaSO₄ . 2H₂O
This equation represents the addition of water molecules to Plaster of Paris, resulting in the formation of Gypsum, which is a hydrated calcium sulfate compound. The reaction is exothermic, and during the process, the plaster solidifies as it returns to its original state of Gypsum.