A student accidentally spills a small amount of dilute sulfuric acid on the laboratory bench and neutralises it with sodium bicarbonate. Which product confirms that a neutralization reaction has occurred?
Formation of carbon dioxide and salt
Dilute sulfuric acid (H2SO4) spilled in a laboratory is neutralized with a mild base such as sodium hydrogen carbonate (baking soda) or a carbonate.
The acid reacts with the hydrogen carbonate/carbonate to form a salt, water and carbon dioxide: H2SO4 + 2NaHCO3 → Na2SO4 + 2H2O + 2CO2.
The brisk effervescence of carbon dioxide along with the formation of a salt shows that the acid has been neutralized.
Hydrogen gas is produced when an acid reacts with an active metal, not in neutralization; metal oxides and oxygen gas are not products of an acid–base reaction.
Hence, the answer is formation of carbon dioxide and salt.
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