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)
Options:
0.4
0.3
0.5
0.7
Correct Answer:
0.3
Explanation:
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
