The answer is sodium chloride solution
Boiling point will increase based on the molality(mol per 1000gram solution) of the solution. The exact value formula should be: T= i * Kb * molality
Kb is the constant of the solvent(water) and i is the Van Hoff factor of the solute.
The molecular mass of sucrose is 342g/mol. The increase of boiling point for sucrose solution is:
T= i * Kb * molality
T= i * Kb * mol / (solvent/ 1000g)
T= 1 * Kb * 15grams/(342grams/mol) / (25gram1000g)
T= 1 * Kb * 0.043mol / 0.025
T= 1.7643 Kb
The molecular mass of sodium chloride is 58.5g/mol and its van hoff factor is 2(it dissolve into Na+ and Cl-). The increase of boiling point for sucrose solution is:
T= i * Kb * molality
T= i * Kb * mol / 1kg solvent
T= 2 * Kb * 35grams/(58.5g/mol) / (500g/1000g)
T= 2 * Kb * 0.598mol / 0.5
T= 2.3931 Kb
