When 4.2 g of sodium bicarbonate is added to a solution of hydrochloric acid weighing 10g. it is observed that 2.2g of carbon dioxide is released into the atmosphere. The residue behind is found to weigh 12g show that, this observation in are in arrangement with the law of conservation of mass.

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Solution

$N a_{2} C O_{3} + 2 H C l ⟶ 2 N a C l + H_{2} O + C O_{2}$
Law of conservation of mass- It states that for any closed system, the mass of the system always remain constant over time, as mass of system cannot change. Therefore, (mass of $N a_{2} C O_{3} +$ mass of $H C l$ ) should be equal to (mass of residue $+$ mass of $C O_{2}$ )
Mass of $N a_{2} C O_{3} = 4.2$ $g$
Mass of $H C l = 10$ $g$
Mass of residue $= 12$ $g$
Mass of $C O_{2} = 2.2$ $g$
$∴$ Mass of $N a_{2} C O_{3} +$ Mass of $H C l = 14.2$ $g$
and Mass of residue $+$ Mass of $C O_{2} = 14.2$ $g$
Therefore, they follow law of conservation of mass.

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Question 1
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