8.4 g of sodium bicarbonate reacts with 20 g of acetic acid to liberate 4.4 g of carbon dioxide gas into the atmosphere. The mass of residue left in the reaction vessel is?

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Detailed Solution

8.4 g of sodium bicarbonate reacts with 20 g of acetic acid to liberate 4.4 g of carbon dioxide gas into the atmosphere. The mass of residue left in the reaction vessel is 24 g.

In this reaction, sodium bicarbonate reacts with acetic acid to produce sodium acetate, carbon dioxide, and water. The reaction equation is as below,
$NaHC O_{3} + C H_{3} COOH \to C H_{3} COONa + C O_{2} + H_{2} O$

According to the law of conservation of masses,

Total masses of reactants = Total masses of products
Reactants are $8.4 g NaHC O_{3} and 20 g C H_{3} COOH$
The total mass of reactants $= 28.4 g$
Mass of residue $= > (28.4 reactants mass) - (4.4 g {CO}_{2})$
$= > 24.0 g residue (sodium acetate solution)$
The mass of residue is therefore 24 g.