How to Calculate Boiling Point Elevation (ΔTb)
Calculate solution boiling shift step-by-step:
Enter Molality (m)
Input solute molal concentration in mol/kg.
Enter Kb Constant
Input ebullioscopic constant Kb (°C/m) for the solvent (0.512 °C/m for water).
Enter van 't Hoff (i)
Input ion dissociation count i (i=1 for non-electrolytes, i=2 for NaCl).
Compute ΔTb
Multiply ΔTb = i × Kb × m and add to pure solvent boiling point.
Key Features & Solution Colligative Properties
Colligative Elevation Engine
Computes exact boiling point shift independent of solute chemical identity.
Ebullioscopic Database
Includes standard Kb constants for water, benzene, ethanol, and chloroform.
Electrolyte Dissociation (i)
Accurately accounts for ionic dissociation multipliers.
Solution Physical Chemistry: Boiling Point Elevation
Boiling Point Elevation (ΔTb) is a colligative property caused by a reduction in solvent vapor pressure when non-volatile solute particles are added:ΔTb = i × Kb × mThe new boiling point of the solution is: Tb(solution) = Tb(pure) + ΔTb.
Frequently Asked Questions
?Why does adding salt to water raise its boiling point?
Dissolved solute particles occupy surface area and attract water molecules, lowering vapor pressure. Extra heat energy is required to raise the vapor pressure back to atmospheric pressure.