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Ebullioscopy
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Assignments:

 

  1. A solution of 0.450 g of urea (molecular weight= 60) in 22.5 g of water showed 0.170 °C of elevation in boiling point. Urea has a van ‘t Hoff factor of, i = 1. Calculate the molal elevation constant of water.

  2. 0.15 g of a substance dissolved in 15 g of solvent boiled at a temperature higher by 0.216 °C than of the pure solvent. Calculate the molecular weight of the substance. Molal elevation constant for the solvent is 2.16 K kg mol-1.

  3. Determine the molecular weight of non-volatile solute (glucose) by ebullioscopically using water as the solvent. Kb = 0.512 (°C/(mol kg-1)), i = 1, WA = 10.2g ,WB = 2 g.

  4.  Determine the boiling point elevation constant, Kb of the solvent chloroform using Sulfur as the solute, WA = 5 g ,WB = 2 g, MB of Sulfur =256.52 g.

  5.  Determine the apparent molecular weight of an electrolyte (Bezamide) in Carbon tetrachloride. Kb = 4.88 (°C/ (mol kg-1)), i= 1,WA = 5 g ,WB = 2 g.

 

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