- Home
- Standard 12
- Chemistry
Formation of a solution from two components can be considered as
$(i)$ Pure solvent $\to$ separated solvent molecules $\Delta$ $H_1$
$(ii)$ Pure solute $\to$ separated solute molecules$\Delta$ $H_2$
$(iii)$ Separated solvent and solute molecules $\to$ solution $\Delta H_3$ Solution so formed will be ideal if
$\Delta {H_{{\rm{soln}}}} = \Delta {H_3} - \Delta {H_1} - \Delta {H_2}$
$\Delta {H_{{\rm{soln}}}} = \Delta {H_1} + \Delta {H_2} + \Delta {H_3}$
$\Delta {H_{{\rm{soln}}}} = \Delta {H_1} + \Delta {H_2} - \Delta {H_3}$
$\Delta {H_{{\rm{soln}}}} = \Delta {H_1} - \Delta {H_2} - \Delta {H_3}$
Solution
Solution so formed will be ideal if $\Delta H _{\text {soln. }}=\Delta H _1+\Delta H _2+\Delta H _3$
Adding $(i)$ to $(iii)$
pure solute + pure solvent $\rightarrow$ solution;
$\Delta H =\Delta H _1+\Delta H _2+\Delta H _3$
