A compound 'X' on heating at 373 Kelvin gives substance 'Y' which is used for making chalk and for plastering factured bones. 'Y' on mixing with water changes to 'X'. Identify 'X' and 'Y' and write chemical reaction.
Answers
Answer:
x is Ca(OH)2 which on heating give substance Y which is Ca i.e. calcium
Answer: Substance Y, calcium oxide (CaO) , Compound X is calcium carbonate (CaCO₃), which on heating at 373 Kelvin (100 degrees Celsius) decomposes into substance Y, calcium oxide (CaO), and carbon dioxide (CO₂).
Explaination:
The chemical equation for the reaction is:
CaCO₃(s) → CaO(s) + CO₂(g)
- Substance Y, calcium oxide (CaO), is commonly known as quicklime, and it is used for making chalk and plastering fractured bones. When mixed with water, quicklime reacts vigorously to produce calcium hydroxide {Ca(OH)₂}, also known as slaked lime, and releases a large amount of heat.
- Slaked lime has many applications, including in the construction industry as a mortar for bricklaying and plastering, in agriculture as a soil amendment.
The chemical equation for the reaction is:
CaO(s) + H₂O(l) → Ca(OH)₂(aq)
Thus, the reaction between Y and water produces X, which is calcium carbonate:
Ca(OH)₂(aq) + CO₂(g) → CaCO₃(s) + H₂O(l)
Overall, the entire process can be summarized as:
CaCO₃(s) → CaO(s) + CO₂(g)
CaO(s) + H₂O(l) → Ca(OH)₂(aq)
Ca(OH)₂(aq) + CO₂(g) → CaCO₃(s) + H₂O(l).
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