Question

Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. How is it recognised?

September 22, 2024

Answer

When dilute hydrochloric acid (HCl) reacts with sodium hydrogen carbonate (NaHCO₃), the gas evolved is carbon dioxide (CO₂).

Recognition:

Carbon dioxide can be recognized by passing it through lime water (a solution of calcium hydroxide). If carbon dioxide is present, the lime water turns milky due to the formation of calcium carbonate.

Chemical Equation:

NaHCO₃(s) + HCl(aq) → NaCl(aq) + H₂O (l) + CO₂ (g)

In this equation:

– Sodium hydrogen carbonate (NaHCO₃) reacts with hydrochloric acid (HCl) to produce sodium chloride (NaCl), water (H₂O), and carbon dioxide (CO₂).

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Question

Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. How is it recognised?

Answer

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