Question:
The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.
Answer:
Carboxylic acid will undergoes in a partial dissociation because it has non polar CH3 group while water is a polar in nature. Fluorine is most electronegative substance and it has highest electron withdrawing inductive effect. Colligative properties of solution depend upon nature of the solute. Trifluoroacetic acid ionizes to the largest extent. Value of colligative properties is directly proportional to ability of dissociation of the solute. Hence the order of the depression in freezing point of water increases in the order
CH3COOH < C13CCOOH < F3CCOOH
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