alleryFor NaCl in water (assumes complete dissociation), van't Hoff factor i =
A3
B1
C0.5
D2 (NaCl → Na⁺ + Cl⁻)
Answer & Solution
Correct answer: D. 2 (NaCl → Na⁺ + Cl⁻)
i = number of particles produced per formula unit.
NaCl → 2 ions, so i = 2 (ideal).
All colligative properties multiply by i: ΔT_f = i × K_f × m.
Real i is slightly less than 2 due to ion pairing.
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