Question

Prove that ethanol is amphoteric

Answer 1

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This is is because the oxygen in ethanol has lone electron pairs capable of accepting protons, and thus ethanol can act as a weak base. Summary - TL/DR: As ethanol has the ability to both donate and accept protons, it should be considered an amphoteric compound with respect to Brønsted–Lowry acid-base theory.

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Answer 2

1. Ethanol reacts with Acid to neutralise to form Ester and water.
$C₂H₅OH+CH₃COOH ------(conc. H₂SO₄)-----> CH₃COOC₂H₅ + H₂O$
2. Ethanol reacts with Base (NaOH) to neutralise and form Sodium Ethoxide and Water.
$C₂H₅OH + NaOH ------> C₂H₅ONa + H₂O$