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Question

A 0.15 molal solution of a solute in water has a freezing point depression of 0.558°C. If the solute dissociates into 2 ions, what is the degree of dissociation? ( Kf = 1.86 K kg mol⁻¹ )

Options

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Explanation

Δ Tf = i · Kf · m . 0.558 = i × 1.86 × 0.15 . i = (0.558/1.86 × 0.15) ≈ 2 . i = 1 + α (n - 1) , 2 = 1 + α (2 - 1) , α = 1 .