Explanation
Dissociation constants (pKa) of trichloroacetic acid is 0.66, dichloroacetic acid is 1.35, chloroacetic acid is 2.87, acetic acid is 4.756 in aqueous solution. The larger the value of pKa , the smaller the extent of dissociation at any given pH. Hence trichloroacetic acid (pKa = 0.66) dissociates to the greatest extent in aqueous solution.
pKa of phenol (carbolic acid) is 9.98 and that of carbonic acid (H2CO3) is 6.63, thus phenol doesnot give effervescence with HCO3– ion.
Vinegar is dilute aqueous solution of acetic acid (CH3COOH). Acetic acid also called as ethanoic acid.
Lemon gives sour taste because of citric acid.
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