A 1.00 molal aqueous solution of trichloroacetic acid (CCl3COOH) is heated to its boiling point. The solution has the boiling point of 100.18°C. Determine the van’t Hoff factor for trichloroacetic acid. (Kb for water = 0.512 K kg mol-1)

0.4 0.3 0.5 0.7

0.3

As ΔTb = iKbm (100.18 – 100)°C = i × 0.512 K kg mol-1 × 1 m 0.18 K = i × 0.512 K kg mol-1 × 1 m ∴  i = 0.3