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Question:

What is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube?

Solution:

On adding dilute HCl to Na₂CO₃ taken in a clean and dry test tube, a brisk effervescence will be observed due to the evolution of CO₂ gas. 2HCl + Na₂CO₃ → 2NaCl + H₂O + CO₂