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 $H_2O(l)$
$NaCl(s)$ and $H_2O(l)$
✓
Answer
For a solution containing non-volatile solute i.e. $NaCl(s)$ and $H_2O(l),$ the Raoult’s law is applicable only to vaporisable component (1) i.e. $H_2O(l)$ and total vapour pressure is written as,
$\text{p}=\text{p}_1=\text{x}_1\text{p}^0_1$
Where ${p_1}^o$ reresents the vapour pressure of pure $H_2O(l)$
$\text{p}=\text{p}_1=\text{x}_1\text{p}^0_1$
Where ${p_1}^o$ reresents the vapour pressure of pure $H_2O(l)$
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