A 1.00 molal aqueous solution of trichloroacetic acid `("CCl"_3COOH)` is heated to its boiling point. The solution has a boiling point of `100.18^@C` . Determine the van't Hoff factor for trichloro acetic acid `(K_b " for water" = 0.512 K kg "mol"^(-1) )` .

Explanation

Apply the relation
` Delta T_b = K_f xx m`
` Delta T_b = 0.512 xx 1 = 0.512`
van.t Hoff facto = Observed elevation in boiling point / Calculated elevation in boiling point
`= (0.18)/(0.512) = 0.3516`