∵∆Tb=Tb−T∘ Where Tb=b.pt of solution Tb∘=b.pt of solvent or Tb=Tb∘+∆Tb Note: Elevation in boiling point is a colligative property, which depends upon the no. of particles. Thus greater the number of particles, greater is it elevation and hence greater will be its boiling point. Na2SO4⇌2Na++SO42− Since Na2SO4 has maximum number of particles (3), hence has maximum boiling point.