Question
Using Raoult’s law explain how the total vapour pressure over the solution is related to mole fraction of components in the following solutions.
NaCl(s) and H2O(l)
NaCl(s) and H2O(l)
✓
Answer
For a solution containing non-volatile solute i.e. NaCl(s) and H2O(l), the Raoult’s law is applicable only to vaporisable component (1) i.e. H2O(l) and total vapour pressure is written as,
$\text{p}=\text{p}_1=\text{x}_1\text{p}^0_1$
Where p1o reresents the vapour pressure of pure H2O(l)
$\text{p}=\text{p}_1=\text{x}_1\text{p}^0_1$
Where p1o reresents the vapour pressure of pure H2O(l)
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