Practice question
Question
A 0.2 molal Na₂SO₄ solution has a van’t Hoff factor of 2.5. What is the freezing point depression? ( Kf = 1.86 K kg mol⁻¹ )
Explanation
Δ Tf = i · Kf · m . Δ Tf = 2.5 × 1.86 × 0.2 = 0.93 K .
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