The Total solution for NCERT class 6-12
The depression in freezing pointof water observed for the same amount of acetic acid, trichloroacetic acid andtrifluoroacetic acid increases in the order given above. Explain briefly.
Among H, Cl, and F, H is leastelectronegative while F is most electronegative. Then, F can withdraw electronstowards itself more than Cl and H. Thus, trifluoroacetic acid can easily lose H+ ionsi.e., trifluoroacetic acid ionizes to the largest extent. Now, the more ionsproduced, the greater is the depression of the freezing point. Hence, thedepression in the freezing point increases in the order:
Acetic acid < trichloroaceticacid < trifluoroacetic acid