Arrange the following solutions in order of their increasing boiling points.\ (i) $10^{-4} \mathrm{

Question

Arrange the following solutions in order of their increasing boiling points.\ (i) $10^{-4} \mathrm{M} \mathrm{NaCl}$ (ii) $\quad 10^{-4} \mathrm{M}$ Urea\ (iii) $10^{-3} \mathrm{M} \mathrm{NaCl}$ (iv) $\quad 10^{-2} \mathrm{M} \mathrm{NaCl}$\

Professor PC Thomas Classes · Answer

(c) : For urea, $i=1$ and for NaCl , $i=2$\ $\Delta T_{b} \propto \mathrm{im}$\ $\Delta T_{b} \propto m$ i.e., $\Delta T_{b} \propto$ No. of moles of solute.\ $\Delta T_{b}$ for $\mathrm{NaCl}>\Delta T_{b}$ for urea\ The increasing order of boiling points is,\ (ii) < (i) < (iii) < (iv).\