Class9, Science, NCERT, CBSE, 2022-2023, Chapter 2, Atoms And Molecules,
NCERT Solutions for Class 9 Science Chapter 3
Atoms And Molecules
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-33
Questions No-1
sodium carbonate + ethanoic acid → sodium ethanoate + carbon dioxide + water
In a reaction, sodium carbonate reacts with ethanoic acid to produce sodium ethanoate,
carbondioxide, and water.
Sodium + Ethanoic → Sodium + Carbon + Water
Carbonate acid ethanoate dioxide
Mass of sodium carbonate = 5.3g (Given)
Mass of ethanoic acid = 6g (Given)
Mass of sodium ethanoate = 8.2g (Given)
Mass of carbon dioxide = 2.2 (Given)
Mass of water = 0.9g (Given)
Now, total mass before the reaction = (5.3 + 6)g
= 11. 3g
and total mass after the reaction = (8.2 + 2.2 + 0.9)g
= 11.3g
Therefore, Total mass before the reaction = Total mass after the reaction
Hence, the given observations are in agreement with the law of conservation of mass.
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Reaction Description:
In this reaction, sodium carbonate reacts with ethanoic acid to produce sodium ethanoate, carbon dioxide, and water.
The equation can be represented as follows:
Na2CO3 + 2CH3COOH → 2 CH3COONa + CO2 + H2O
Given Information:
– Mass of sodium carbonate (Na2CO3) = 5.3g
– Mass of ethanoic acid (CH3COOH) = 6g
– Mass of sodium ethanoate (CH3COONa) = 8.2g
– Mass of carbon dioxide (CO2) = 2.2g
– Mass of water (H2O) = 0.9g
Analysis:
1. Total Mass before the Reaction:
– Mass of sodium carbonate + Mass of ethanoic acid = 5.3g + 6g = 11.3g
2. Total Mass after the Reaction:
– Mass of sodium ethanoate + Mass of carbon dioxide + Mass of water = 8.2g + 2.2g + 0.9g = 11.3g
Conclusion:
The total mass before the reaction matches the total mass after the reaction, both equaling 11.3 grams. This observation aligns perfectly with the law of conservation of mass.
Explanation:
– Conservation of Mass Principle: This law states that in any chemical reaction, the total mass of the substances before the reaction is equal to the total mass of the substances after the reaction.
– Observation Comparison:
– Before Reaction:
– Mass of sodium carbonate + Mass of ethanoic acid = 5.3g + 6g = 11.3g
– After Reaction:
– Mass of sodium ethanoate + Mass of carbon dioxide + Mass of water = 8.2g + 2.2g + 0.9g = 11.3g
– Equality in Mass:
– The total mass before the reaction matches the total mass after the reaction, both being 11.3 grams.
– Implication:
– This correspondence confirms that no mass is either lost or gained during the chemical reaction between sodium carbonate and ethanoic acid.
– Conclusion:
– The given observations align perfectly with the law of conservation of mass, demonstrating that mass remains constant in a chemical reaction, affirming a fundamental principle in chemistry.