Question

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Answer 1

Question :-

In a reaction, 5.3g of Sodium Carbonate reacted with 6g of ethanoic acid. The products were 2.2g of CO2, 0.9g of water and 8.2g of Sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass, Sodium Carbonate + Ethanoic acid = Sodium ethanoate + Carbon dioxide + Water.

Solution :-

Law of conservation of Mass States that "Mass is neither created, nor destroyed". i.e Mass of Reactants = Mass of products.

Reactants :-

Mass of Sodium Carbonate = 5.3g

Mass of ethanoic acid = 6g

Total mass of reactants

= 5.3 + 6

= 11.3g

Products :-

Mass of Carbon Dioxide = 2.2g

Mass of Water = 0.9g

Mass of Sodium ethanoate = 8.2g

Total mass of products

= 2.2 + 0.9 + 8.2

= 3.1 + 8.2

= 11.3g

Here, Mass of Reactants = Mass of products

•°• This reaction is in agreement with the law of conservation.

Answer 2

The law of conservation of mass states that,

“Mass reactants and products remain constant after a chemical reaction.”

Or, in simple terms — Mass cannot be destroyed. [Exception: When mass gets converted into energy, e.g., when a wooden stick burns.]

Mass before reaction:-

5.3 g (Sodium Carbonate) + 6 g (Ethanoic acid)

= 11.3 g

Mass after reaction:-

2.2 g (Carbon Dioxide) + 0.9 g (Water) + 8.2 g (Sodium Ethanoate)

= 11.3 g

$\longrightarrow$ LHS = RHS.

Or, the reaction is with agreement with the law.