An aqueous solution of an electrolyte A ₃ B is prepared by dissolving 0.5625 moles in 750 ml of water and is found to be 80% ionised. If K _ b for water is 0.52 K kg mol ⁻¹ , calculate the boiling point of the solution at 1.0 atm pressure.

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An aqueous solution of an electrolyte A ₃ B is prepared by dissolving 0.5625 moles in 750 ml of water and is found to be 80% ionised. If K _ b for water is 0.52 K kg mol ⁻¹ , calculate the boiling point of the solution at 1.0 atm pressure. (Assume the boiling point of pure water is 373 K).

Quantrex Academy · Accepted Answer

Correct answer: C. 374.33 K

Molality: m = 0.5625 0.75 = 0.75 m A₃B dissociates into 4 ions, n = 4 , = 0.8 Van't Hoff factor: i = 1 + (n-1) = 1 + 3 0.8 = 3.4 T_b = i K_b m = 3.4 0.52 0.75 = 1.326 K T_b = 373 + 1.326 374.33 K

An aqueous solution of an electrolyte A ₃ B is prepared by dissolving 0.5625 moles in 750 ml of water and is found to be 80% ionised. If K _ b for water is 0.52 K kg mol ⁻¹ , calculate the boiling point of the solution at 1.0 atm pressure. (Assume the boiling point of pure water is 373 K).

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