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Prolonged boiling of a salt soluation (NaCl) results in a steady rise in the boiling...

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user5290002 | eNotes Newbie

Posted June 24, 2013 at 11:24 AM via web

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Prolonged boiling of a salt soluation (NaCl) results in a steady rise in the boiling point. Account for this effect. 

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jerichorayel | College Teacher | (Level 1) Senior Educator

Posted June 24, 2013 at 12:10 PM (Answer #1)

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Relating with the boiling point elevation, the addition of solute in the solution would increase the temperature of the boiling point. The expression:

`Delta T = K_b * m * i`

Where:

`m` = molality 

`k_b` = Ebullioscopic constant

`i ` = Van't Hoff factor

`Delta T` = (boiling point solution - boiling point pure solvent)

From the given expression, `Delta T` is directly proportional with the molality. As time passes by, the water molecules will evaporate thus increasing the molality of the solution. Increasing the molality will increase the temperature of the solution.

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