Practice question
Question
A 0.1 molal solution of a solute in water has a boiling point elevation of 0.156°C. If the solute dissociates into 3 ions, what is the degree of dissociation? ( Kb = 0.52 K kg mol⁻¹ )
Explanation
Δ Tb = i · Kb · m . 0.156 = i × 0.52 × 0.1 . i = (0.156/0.52 × 0.1) = 3 . i = 1 + α (n - 1) , 3 = 1 + α (3 - 1) , 2α = 2 , α = 1 .
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