Chapter 3

NCERT
Class 9
Science
Solutions
1. In a reaction 5.3g of Sodium carbonate reacted with 6g of ethanoic acid. The products were 2.2g of Carbon dioxide, 0.9g water and 8.2g of Sodium ethonoate.

Question:

In a reaction 5.3g of Sodium carbonate reacted with 6g of ethanoic acid. The products were 2.2g of Carbon dioxide, 0.9g water and 8.2g of Sodium ethonoate. Show that these observations are in agreement with the law of conservation of mass. Sodium carbonate + Ethanoic acid → Sodium Ethanoate Carbon dioxide + Water.

Answer:

Mass of Sodium Carbonate = 5.3g

Mass of acitic acid = 6.0g

Mass of reatants = 5.3g + 6.0g = 11.3g

Mass of carbon dioxide = 2.2g

Mass of sodium acitate = 8.2g

Mass of Products = 2.2 + 8.2 + 0.9 = 11.3g

Mass of reactants = Mass of Products

Therefore the given data shows that observations are in agreement with the law of consevation of mass.

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