What is observed when ethanoic acid is added to aqueous sodium hydrogencarbonate?
Correct answer A. Effervescence of carbon dioxide
Explanation
Carboxylic acids are stronger than carbonic acid, so they release CO₂ from hydrogencarbonates: CH₃COOH + NaHCO₃ → CH₃COONa + H₂O + CO₂. This fizzing distinguishes them from phenols and alcohols.
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