Practice question
Question
A 0.2 molal solution of a solute in water has a freezing point depression of 0.744°C. If the solute dissociates into 2 ions, what is the degree of dissociation? ( Kf = 1.86 K kg mol⁻¹ )
Explanation
Δ Tf = i · Kf · m . 0.744 = i × 1.86 × 0.2 . i = (0.744/1.86 × 0.2) = 2 . i = 1 + α (n - 1) , 2 = 1 + α (2 - 1) , α = 1 .
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