Question
The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroaacetic acid increases in the order given. Explain briefly.
Solution
Answer:
Among H,Cl and F, Hydrogen is least electronegtive while F is most electronegtive than Cl and H.
Thus F can withdraws more electron towards itslef more than Cl and H. So trifluoroacetic acid can easily lose the H+ ions. i.e.
trifluroacetic acid ionize to the larger extent .
Now more the ion produces the greater is the dpress ion of the freezing point
Hence, the depression of freezing point increase in order :
Acetic acid<trichloracetic acid < trifluroacetic acid
