Question

why do basicity of acetic acid is 1 even though it has 4 hydrogen atoms in it?

Answer 1

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So H atom attached to the oxygen can easily depart as H+. CH3COOH Is a weak acid and does not completely dissociated in aqueous solution. when it dissociates in aqueous solution it gives out CH3COO- and H3O+ ion. so it gives out only one H+ , hence its basicity is one .
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Answer 2

becoz only one H of CH3COOH is joint with O .
others are jointed with C.