As ∆Tbb=Tb−Tbo Where Tb=b. pt of solution Tbo=b.pt of solvent or Tb=Tbo+∆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.